types: added missing iso time types

[gulbaki]

Adding missing TypeScript support for iso-time and iso-date-time formats
Adding documentation for both formats in the API reference
Providing dedicated unit and TypeScript test coverage
fixes: #267

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[mcollina]

lgtm

[Copilot]

Pull Request Overview

Adds TypeScript support for two missing ISO format types (iso-time and iso-date-time) to the FluentJSONSchema library. This addresses issue #267 by implementing complete TypeScript definitions and test coverage for these ISO datetime formats.

• Added TypeScript type definitions for iso-time and iso-date-time string formats
• Extended test coverage with unit tests and TypeScript validation tests
• Updated API documentation to include the new ISO format types

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
types/FluentJSONSchema.test-d.ts	Adds TypeScript test case validating the new ISO format types
src/StringSchema.test.js	Adds unit test for the ISO_TIME format validation
docs/API.md	Updates documentation to include ISO_TIME and ISO_DATE_TIME formats

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[Fdawgs]

Related to #254

[Uzlopak]

RSLGTM