Add endpoint to completely delete a Python index from Thoth storage

[VannTen]

Related Issues and Dependencies

Required for #790

This introduces a breaking change

• Yes
• No

This Pull Request implements

Add endpoint to completely delete a Python index from Thoth storage.

Description

WIP

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Rest will come later, but if the API endpoint looks bad, let me know.

[sesheta]

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[sesheta]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all