feat: add merkl yield claim transaction type to TransactionType enum

[PatrykLucka]

Explanation

Adds a new merklYieldClaim transaction type to the TransactionType enum in the transaction controller. This enables the controller to properly categorize and handle transactions that claim yield rewards from Merkl Yield contracts (mUSD claim bonus). Without this type, Merkl yield claim transactions would fall under a generic category, making it harder to track and display them appropriately in the UI.

References

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

Introduces a new TransactionType enum value musdClaim to categorize mUSD yield claim transactions.

• Adds musdClaim in src/types.ts
• Updates CHANGELOG.md under Unreleased

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