Closes #7170 Fonts download data measurement

[remyperona]

Description

Fixes #7170

Type of change

• Sub-task of Host Google Fonts Locally #7039

Detailed scenario

With rocket debug log enabled, load a page. Data will be available in the log:

• Number of fonts downloaded for each CSS file
• Download time for each font
• Average download time of fonts in each CSS file

Technical description

Documentation

Count the number of fonts downloaded in each CSS files. Measure the download time for each font. Use those values to generate an average download time per CSS file.

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 did not introduce unnecessary complexity.

Unticked items justification

No tests to add

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.02% (target: -0.10%)	✅ 100.00% (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (0c3c6fa)	38438	16880	43.91%
Head commit (9436176)	38449 (+11)	16891 (+11)	43.93% (+0.02%)

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 (#7173)	11	11	100.00%

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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[wordpressfan]

Minor changes/questions