Integrated drf-spectacular library

[varshadr]

Fixes #2938

This pull request integrates drf-spectacular library to Mathesar's backend codebase

Technical details

• I have added the "drf-spectacular" package to the project's dependencies
• Configured the SPECTACULAR_SETTINGS in the Mathesar's settings file

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the develop branch of the repository
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[silentninja]

Looks good!