feat(ccip): add rate limits API with token finality and internalIdFormat support

Expose CCIP rate limits data via new lane endpoints, add token finality details, and support both chains.json keys and selector names as input/output formats.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: aelmanaa

jest.config.cjs

@@ -35,5 +35,5 @@ module.exports = {
     "\\.ya?ml$": "<rootDir>/src/__mocks__/yamlMock.ts",
   },
   transformIgnorePatterns: ["/node_modules/(?!.*\\.mjs$)"],
-  testPathIgnorePatterns: ["/node_modules/", "src/tests/chain-api.test.ts"],
+  testPathIgnorePatterns: ["/node_modules/", "src/tests/chain-api.test.ts", "src/tests/chain-identifier-service.test.ts"],
 }