Add a build process for the plugins directory plugin.

[mukeshpanchal27]

Follow-up: #1000 (comment)

Currently, for the deploy process, we added plugin versions per #935 (comment). However, as per @westonruter's feedback in #1000 (comment), we should avoid defining the version in three places (plugin main file, readme file, and plugins.json file). We need to think of a better workflow to manage their version in a single place to avoid updating in multiple places.

[thelovekesh]

@mukeshpanchal27 @westonruter I will be picking up this as we are doing something similar at #893

[felixarntz]

@mukeshpanchal27 Just spotting this, I believe this is addressing the same concern I just voiced in #935 (comment)?

[mukeshpanchal27]

Yes. Closing this now.