feat(trs): add CLI support

[pavelnikonorov]

Add CLI commands leveraging the SDK TRS client (#61) to support for the GA4GH Tool Registry Service (TRS) API, version 2.0.1.

This issue requires addressing the following tasks:

Implement the following commands in ./cli/src/main.rs:

• List all tools:

ga4gh-cli trs list

• Retrieve detailed information for a specific tool by ID:

ga4gh-cli trs info [tool-id]

• List all versions of a specific tool:

ga4gh-cli trs files [tool-id] [version-id] [descriptor-type]

• Retrieve tests for a specific tool version:

ga4gh-cli trs tests [tool-id] [version-id] [descriptor-type]

• Retrieve additional descriptor files for a tool, using a relative path:

ga4gh-cli trs descriptors [tool-id] [version-id] [descriptor-type] [relative-path]

• Add unit tests to ensure the reliability of the CLI TRS Client.
• Update CLI documentation with examples for each TRS method.

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.