Fix/iso time types tests

[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

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