add ReferenceHolding to MPTokenIssuance and vault_info shares

[Patel-Raj11]

High Level Overview of Change

Adds the ReferenceHolding field to the MPTokenIssuance ledger type and the vault_info response's shares object.

Corresponding rippled PR: XRPLF/rippled#7077

Additionally, this PR takes the opportunity to fix discrepancies found in MPTokenIssuance and VaultInfoResponse:

• Added missing fields (Sequence, DomainID) to MPTokenIssuance ledger type.
• Added missing fields (AssetScale, MaximumAmount, TransferFee, MPTokenMetadata, LockedAmount) to the vault_info response shares object.
• Fixed incorrect optionality of Flags, ShareMPTID, WithdrawalPolicy, and OwnerNode in VaultInfoResponse — these are required per Vault ledger type but were incorrectly marked optional.
• JSDoc comments sourced from XLS-0033.

Context of Change

When a vault is created, rippled now sets a ReferenceHolding field on the vault's share MPTokenIssuance. This field points to the vault pseudo-account's holding for the underlying asset (MPToken keylet for MPT-backed vaults, RippleState keylet for IOU-backed vaults, absent for XRP-backed vaults). The client library types need to reflect this.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Tests (you added tests for code that already exists, or your new feature included in this PR)
• Documentation update
• Release

Did you update HISTORY.md?

• Yes
• No, this change does not impact library users

Test Plan

• Integration tests assert ReferenceHolding is defined on IOU and MPT backed vault shares

[coderabbitai]

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main changes: adding ReferenceHolding to both MPTokenIssuance and vault_info shares, which is the primary focus of the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description follows the template structure with all required sections completed: High Level Overview, Context of Change, Type of Change (with appropriate checkboxes selected), and confirmation that HISTORY.md was updated.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-ReferenceHolding

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@packages/xrpl/test/integration/transactions/singleAssetVault.test.ts`:
- Around line 154-157: Before making ledger_entry requests, assert that
vaultInfoResult.result.vault.ShareMPTID is present and non-empty; if missing
throw or fail the test with a clear message. Update the two places that call
testContext.client.request({ command: 'ledger_entry', mpt_issuance:
vaultInfoResult.result.vault.ShareMPTID }) to first check
vaultInfoResult.result.vault && vaultInfoResult.result.vault.ShareMPTID and
produce an explicit test failure (or throw) naming ShareMPTID and
vaultInfoResult, so the ledger_entry call is only performed when ShareMPTID is
defined.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: 30475d1e-569a-4947-a61f-45107c28587f

📥 Commits

Reviewing files that changed from the base of the PR and between 5f873bc and 4441029.

📒 Files selected for processing (5)

• .ci-config/xrpld.cfg
• packages/xrpl/HISTORY.md
• packages/xrpl/src/models/ledger/MPTokenIssuance.ts
• packages/xrpl/src/models/methods/vaultInfo.ts
• packages/xrpl/test/integration/transactions/singleAssetVault.test.ts