Adds a plugin family package to be shared across our plugins

[jeawhanlee]

Description

A package to organise and display WP Media plugin family across other members.

Fixes wp-media/imagify-plugin#908

Explain how this code impacts users.
Displays the WP Media plugin family across other member plugins.

Type of change

• Release

Detailed scenario

No Issue

Technical description

Documentation

A composer package that gathers all the member plugins data and sorts them based on activated status ordered by categorized or uncategorized and then adds a controller handler to perform installation & activation actions.

New dependencies

N/A

Risks

N/A

Mandatory Checklist

Code validation

• I validated all the Acceptance Criteria. If possible, provide screenshots or videos.
• I triggered all changed lines of code at least once without new errors/warnings/notices.
• I implemented built-in tests to cover the new/changed code.

Code style

• I wrote a self-explanatory code about what it does.
• I protected entry points against unexpected inputs.
• I did not introduce unnecessary complexity.
• Output messages (errors, notices, logs) are explicit enough for users to understand the issue and are actionnable.

Additional Checks

• In the case of complex code, I wrote comments to explain it.
• When possible, I prepared ways to observe the implemented system (logs, data, etc.).
• I added error handling logic when using functions that could throw errors (HTTP/API request, filesystem, etc.)

[jeawhanlee]

The README is still WIP.

[jeawhanlee]

The README is still WIP.

Done ✅

[remyperona]

Could we update the repository name from wp-media-plugin-family to plugin-family? The namespace is already there.

We should also add PHPStan to the CI