Closes #944 Add filter for imagify stat

[Khadreal]

Description

Fixes #944
Add filter for imagify stat

Type of change

• Enhancement (non-breaking change which improves an existing functionality).

Detailed scenario

Check #944

Technical description

Documentation

Add a filter and set default to false, when set to true it should load the imagify attachment dropdown stat.

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.

[wordpressfan]

Awesomeeeeeeeeeeeeeee