feat: add CAIP-19 asset identifiers for each chain into the state (#7609)

## Explanation

### Current State
The `NetworkEnablementController` tracks which networks are
enabled/disabled but lacks information about the native asset identifier
for each chain. This information is needed to properly identify native
assets across different blockchain networks using a standardized format.

Extension UI PR:
MetaMask/metamask-extension#39234


### Solution
This PR adds a new state property `nativeAssetIdentifiers` to the
`NetworkEnablementController` that maps CAIP-2 chain IDs to CAIP-19-like
native asset identifiers.

For example:
- `eip155:1` → `eip155:1/slip44:60` (Ethereum uses ETH, SLIP-44 coin
type 60)
- `eip155:56` → `eip155:56/slip44:714` (BSC uses BNB, SLIP-44 coin type
714)
- `solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp` →
`solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp/slip44:501`

### Implementation Details
1. **New `Slip44Service`**: A service that wraps the `@metamask/slip44`
package to look up SLIP-44 coin types by symbol (e.g., `ETH` → `60`,
`BTC` → `0`).

2. **State Updates**: The `nativeAssetIdentifiers` state is
automatically updated when:
   - A network is added (`NetworkController:networkAdded`)
   - A network is removed (`NetworkController:networkRemoved`)
- A network's native currency symbol is changed
(`NetworkController:stateChange`)

3. **Default State**: Popular networks are pre-populated with their
correct native asset identifiers based on their native currency symbols.

4. **Graceful Handling**: If a symbol has no SLIP-44 mapping, the entry
is removed from the state rather than storing an invalid identifier.

### Dependency Addition
Added `@metamask/slip44` package to dynamically look up SLIP-44 coin
types instead of hardcoding them, ensuring accuracy and maintainability.

## References

- [SLIP-44
Standard](https://github.com/satoshilabs/slips/blob/master/slip-0044.md)
- [CAIP-2 Chain ID
Specification](https://github.com/ChainAgnostic/CAIPs/blob/main/CAIPs/caip-2.md)
- [CAIP-19 Asset Identifier
Specification](https://github.com/ChainAgnostic/CAIPs/blob/main/CAIPs/caip-19.md)
- [@metamask/slip44 npm
package](https://www.npmjs.com/package/@metamask/slip44)

## Checklist

- [x] I've updated the test suite for new or updated code as appropriate
- [x] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [ ] I've communicated my changes to consumers by [updating changelogs
for packages I've
changed](https://github.com/MetaMask/core/tree/main/docs/processes/updating-changelogs.md)
- [ ] I've introduced [breaking
changes](https://github.com/MetaMask/core/tree/main/docs/processes/breaking-changes.md)
in this PR and have prepared draft pull requests for clients and
consumer packages to resolve them

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Introduces native asset tracking and supporting utilities.
> 
> - Adds `nativeAssetIdentifiers` mapping (CAIP-2 ->
`.../slip44:<coinType>`) to `NetworkEnablementController` state and
metadata
> - New `Slip44Service` (uses `@metamask/slip44` and chainid.network) to
resolve coin types by symbol/chainId; exports helpers
> - Makes `init()` async and populates EVM identifiers; new
`initNativeAssetIdentifiers(networks)` API for bulk initialization
> - Updates network lifecycle: on add (async) computes and stores
identifier; on remove deletes identifier
> - Extends public exports (types, service) and adds `@metamask/slip44`
dependency
> - Updates/extends tests for controller, selectors, utils, and new
service
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
f8cdcfc. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: salimtb

eslint-suppressions.json

@@ -1468,17 +1468,6 @@
       "count": 1
     }
   },
-  "packages/network-enablement-controller/src/NetworkEnablementController.ts": {
-    "@typescript-eslint/explicit-function-return-type": {
-      "count": 1
-    },
-    "@typescript-eslint/prefer-nullish-coalescing": {
-      "count": 2
-    },
-    "id-length": {
-      "count": 7
-    }
-  },
   "packages/network-enablement-controller/src/selectors.ts": {
     "@typescript-eslint/explicit-function-return-type": {
       "count": 3

packages/network-enablement-controller/CHANGELOG.md

@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add `nativeAssetIdentifiers` state property that maps CAIP-2 chain IDs to CAIP-19-like native asset identifiers (e.g., `eip155:1/slip44:60`) ([#7609](https://github.com/MetaMask/core/pull/7609))
+- Add `Slip44Service` to look up SLIP-44 coin types by native currency symbol ([#7609](https://github.com/MetaMask/core/pull/7609))
+- Add `@metamask/slip44` dependency for SLIP-44 coin type lookups ([#7609](https://github.com/MetaMask/core/pull/7609))
+- Subscribe to `NetworkController:stateChange` to update `nativeAssetIdentifiers` when a network's native currency changes ([#7609](https://github.com/MetaMask/core/pull/7609))
+
 ### Changed
 
 - Upgrade `@metamask/utils` from `^11.8.1` to `^11.9.0` ([#7511](https://github.com/MetaMask/core/pull/7511))

packages/network-enablement-controller/package.json

@@ -54,6 +54,7 @@
     "@metamask/messenger": "^0.3.0",
     "@metamask/multichain-network-controller": "^3.0.1",
     "@metamask/network-controller": "^28.0.0",
+    "@metamask/slip44": "^4.3.0",
     "@metamask/transaction-controller": "^62.9.1",
     "@metamask/utils": "^11.9.0",
     "reselect": "^5.1.1"