feat(a11y): Add aria-label to controls

[Sundava]

Description

Add aria-label attribute to servers select box, based on server URL
Add aria-label attribute to various parameters, based on path method query|body|path param_name

Motivation and Context

Required to comply to accessibility rules for screen readers
Fixes #6512

How Has This Been Tested?

Has been locally tested on Chrome by inspecting the DOM, ran test suite to ensure no regression.
Looking

Checklist

My PR contains...

• No code changes (src/ is unmodified: changes to documentation, CI, metadata, etc.)
• Dependency changes (any modification to dependencies in package.json)
• Bug fixes (non-breaking change which fixes an issue)
• Improvements (misc. changes to existing features)
• Features (non-breaking change which adds functionality)

My changes...

• are breaking changes to a public API (config options, System API, major UI change, etc).
• are breaking changes to a private API (Redux, component props, utility functions, etc.).
• are breaking changes to a developer API (npm script behavior changes, new dev system dependencies, etc).
• are not breaking changes.

Documentation

• My changes do not require a change to the project documentation.
• My changes require a change to the project documentation.
• If yes to above: I have updated the documentation accordingly.

Automated tests

• My changes can not or do not need to be tested.
• My changes can and should be tested by unit and/or integration tests.
• If yes to above: I have added tests to cover my changes.
• If yes to above: I have taken care to cover edge cases in my tests.
• All new and existing tests passed.

Personal comment: I have not yet included the required tests as discussed here, mostly because this being my first PR both in React and in this repo, I wanted to make sure I was going in the right direction before spending more time on it.