Closes #7062 Fonts filesystem

[Khadreal]

Description

Add a working prototype for font optimisation backend filesystem

Fixes #7062

Type of change

• Sub-task of 3.18 - Backend and filesystem part #7062

Detailed scenario

N/A

Technical description

Documentation

This feature allow for the download of media fonts locally, it introduce a new namespace Media\Fonts with three new classes Fonts, Subscriber and Filesystem.
The method write_font_css accepts two arguments, the font url and the provider and use those information to download the font and store locally. When the Filesystem class is initialised there's a setter method to declare the version of the fonts

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.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for a6e21f51	✅ 88.42% (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a6e21f5)	Report Missing	Report Missing	Report Missing
Head commit (fe13945)	38342	16829	43.89%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#7083)	95	84	88.42%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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Footnotes

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