Free API calls and Enabling the API Explorer for calls not in Production

[sanjam-deriv]

This PR makes the following changes in the API Explore

• User can now test API Calls without selecting them from the dropdown
• The text box is enabled intially without any request being selected
• Free API Calls from the backend can now be tested on the API Explorer if they are a part of the WS connection

[review-deriv]

PR description is too short. You can use this format:

# Description
This is a summary of the changes. This should describe why do we need this change.
Whys and Hows come here.

# Cards
* https://clickup.com/12345
* https://clickup.com/12346

[vercel]

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Name	Status	Preview	Updated (UTC)
deriv-api-docs	✅ Ready (Inspect)	Visit Preview	Dec 12, 2023 2:51pm

[coveralls]

Pull Request Test Coverage Report for Build 7183156216

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report.
To ensure accuracy in future PRs, please see these guidelines.
A quick fix for this PR: rebase it; your next report should be accurate.

• 11 of 13 (84.62%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 97.561%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/hooks/useSubscription/index.tsx	4	5	80.0%
src/hooks/useWs/index.tsx	7	8	87.5%

Totals
Change from base Build 7127378057:	-0.2%
Covered Lines:	1622
Relevant Lines:	1627

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💛 - Coveralls