feat: add endpoints for custom JS library add / remove / get

[sumitsum]

Description

• The PR adds REST API endpoints to enable the following:
  • add a new custom JS library to application (PATCH request)
  • remove a previously added custom JS library from application (PATCH request)
  • get a list of all installed custom JS libraries in an application (GET request)
• List of custom installed JS libraries is added to the Application class.
• This PR introduces new controller and repository classes for custom JS lib related operations.
• Instead of fetching / updating the entire domain object, only the custom JS lib related objects are fetched / updated.
• Please note that the JUnit test cases will be added separately. It is tracked here.
• TODO: The following action items will be picked up ASAP, however these action items will not be treated as a blocker to the feature since all features promised as part of Custom JS Lib project will still be fully functional without the presence of these items:
  • check if add or remove end point implementations can directly update the DB array instead of fetching the array, updating them and writing back. Otherwise, wrap the function in a lock so that simultaneous updates don't cause inconsistency. It is tracked here.
  • check if import / export feature works fine with the new changes. Tracked here.
  • check if git sync feature works fine with the new changes. Tracked here.

Fixes #18155 #18156 #18157 #18158

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Manual
• JUnit TC will be picked up ASAP. It is tracked here.

Checklist:

Dev activity

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] PR is being merged under a feature flag

QA activity:

• [ ] Test plan has been approved by relevant developers
• [ ] Test plan has been peer reviewed by QA
• [ ] Cypress test cases have been added and approved by either SDET or manual QA
• [ ] Organized project review call with relevant stakeholders after Round 1/2 of QA
• [ ] Added Test Plan Approved label after reveiwing all Cypress test

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Name	Status	Preview	Updated
appsmith	⬜️ Ignored (Inspect)		Dec 12, 2022 at 10:22AM (UTC)

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[sumitsum]

Closing this since we have directly merged the change into release via PR: https://github.com/appsmithorg/appsmith/pull/18904