feat: add Bip122AccountChangedNotifications to KnownSessionProperties

[baptiste-marchand]

Explanation

Add Bitcoin accountChanged event support, following the previous work done for Solana and Tron.

References

Related to #7304

Checklist

• I've updated the test suite for new or updated code as appropriate
• 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
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Adds Bip122AccountChangedNotifications to KnownSessionProperties and updates tests and changelog accordingly.

• chain-agnostic-permission:
  • KnownSessionProperties: Add Bip122AccountChangedNotifications (bip122_accountChanged_notifications) in src/scope/constants.ts.
  • Tests: Update snapshots and validations to include Bip122 (and assert Tron) in constants.test.ts and supported.test.ts (isKnownSessionPropertyValue, isSupportedSessionProperty).
  • Changelog: Document new session property under Unreleased.

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