feat: Plat-6521 add turnkey hosted signer support (evm, solana) (#174)

* chore: add solana turnkey initial support

* chore: evm improvements

* chore: refactor turnkey service

* chore: improvements

* chore: add tests

* chore: add more tests

* chore: add more tests

* chore: add more tests

* chore: refactor and lint

* chore: remove println

* chore: cargo update

* chore: add turnkey docs section

* chore: add examples

Author: zeljkoX

Cargo.lock

@@ -73,6 +73,7 @@ secrets = { version = "1.2"}
 libsodium-sys = "0.2.7"
 zeroize = "1.8"
 subtle = "2.6"
+p256 = { version = "0.13.2" }
 
 [dev-dependencies]
 cargo-llvm-cov = "0.6"

Cargo.toml

@@ -200,6 +200,8 @@ For quick setup with various configurations, check the https://github.com/OpenZe
 * `basic-example-metrics`: Setup with Prometheus and Grafana metrics
 * `vault-secret-signer`: Using HashiCorp Vault for key management
 * `vault-transit-signer`: Using Vault Transit for secure signing
+* `evm-turnkey-signer`: Using Turnkey for EVM secure signing
+* `solana-turnkey-signer`:  Using Turnkey for Solana secure signing
 
 Each example includes a README with step-by-step instructions and Docker Compose configuration.
 ====
@@ -460,6 +462,7 @@ Supported signer types:
 - `vault`: vault secret signer
 - `vault_cloud`: hosted vault secret signer
 - `vault_transit`: vault transit signer
+- `turnkey`: turnkey signer
 
 Available configuration fields
 [cols="1,1,2"]
@@ -609,6 +612,37 @@ Available configuration fields
 |===
 
 
+`turnkey` type config:
+[cols="1,1,2"]
+|===
+|Field |Type |Description
+
+| api_public_key
+| String
+| The public key associated with your Turnkey API access credentials. Used for authentication to the Turnkey signing service.
+
+| api_private_key.type
+| String
+| Type of value source (`env` or `plain`)
+
+| api_private_key.value
+| String
+| The Turnkey API private key or environment variable name containing it. Used with the public key to authenticate API requests.
+
+| organization_id
+| String
+| Your unique Turnkey organization identifier. Required to access resources within your specific organization.
+
+| private_key_id
+| String
+| The unique identifier of the private key in your Turnkey account that will be used for signing operations.
+
+| public_key
+| String
+| The public key corresponding to the private key identified by private_key_id. Used for address derivation and signature verification.
+|===
+
+
 ==== 2. Notifications
 
 * `notifications` array, which should contain, at least, one valid configuration: