API - Remove Legacy Plugin Code

[meetulr]

Describe the issue

The current plugin system does not meet our requirements in terms of functionality and scalability. We plan to implement an intuitive, robust and scalable plugin architecture with this GSoC project.

Describe the solution

Remove any existing code related to the plugin functionality.

Additional Context

Companion issue: PalisadoesFoundation/talawa-admin#3793

[hustlernik]

@meetulr Please assign this issue.

[hustlernik]

I have done some research on plugin architecture, after creating a draft, I will share with you soon.

[hustlernik]

Also currently assigned issue to implement block functionality is almost done, so I will raise PR for that today.

[bandhan-majumder]

@meetulr assign please

[meetulr]

@hustlernik, you’re already assigned to 3 issues. Our policy allows a maximum of 2 issues per contributor.