test: add TypeScript SDK utility tests

[MD-Mushfiqur123]

Closes #406

Adds additional edge case tests to existing TypeScript SDK utility test files:

utils_pattern.test.ts (5 new tests):

• Empty pattern
• Empty value
• Multiple wildcards
• Dots and plus signs
• Wildcard prefix with suffix

utils_schema.test.ts (5 new tests):

• Nested zod objects with arrays and optionals
• Zod enums
• Non-object non-zod values
• Preserves $schema on plain objects
• Zod with default values

utils_http_agents.test.ts (2 new tests):

• httpAgent instanceof check
• httpsAgent instanceof check

cd sdk/typescript && npm run test:core -- tests/utils_*.test.ts
Tests  24 passed (24)

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