feat(trs): add SDK support

[pavelnikonorov]

Add SDK support foor the GA4GH Tool Registry Service (WES) API, version 2.0.1.

This issue requires addressing the following steps:

• In the ./lib/src/clients/trs folder, and based on the models added in feat(trs): add models #60, implement a module with client methods for communicating with the TRS API; these include methods for
  • get list of tools
  • get tool details
  • list tool versions
  • list files of a tool version
  • get tests for a tool version
  • get additional tool descriptor files relative to a tool
• Document your code; use the TES client as a template/example
• Provide unit tests for your code; again, use the available TES client as a template/example

Additional context

• This issue is part of meta issue feat(trs): add support for the GA4GH TRS API #59. Refer to it for context and additional information.
• This issue requires feat(trs): add models #60 to be addressed first.