chore: add single call contract for SEI

[stanleyyconsensys]

Explanation

Adds SEI to SINGLE_CALL_BALANCES_ADDRESS_BY_CHAINID with its single-call balance checker address and updates the changelog.

Assets Controllers: Token detection: Add SEI to SINGLE_CALL_BALANCES_ADDRESS_BY_CHAINID with address 0xf8b06Cf47E6BFcA5b468D5BAF88217BF25fdD134 in src/AssetsContractController.ts.

References

Fixes https://consensyssoftware.atlassian.net/browse/BENE-222

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, highlighting breaking changes as necessary
• [ ] I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

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[!NOTE] Adds SEI to SINGLE_CALL_BALANCES_ADDRESS_BY_CHAINID with its single-call balance checker address and updates the changelog.

• Assets Controllers:
  • Token detection: Add SEI to SINGLE_CALL_BALANCES_ADDRESS_BY_CHAINID with address 0xf8b06Cf47E6BFcA5b468D5BAF88217BF25fdD134 in src/AssetsContractController.ts.
• Changelog:
  • Under Unreleased, document addition of SEI single-call balances entry.

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