feat: Clover PHP parser

[iurev]

Closes: https://github.com/coverallsapp/coveralls/issues/1889 https://github.com/lemurheavy/coveralls-public/issues/1721#top

Closes https://github.com/coverallsapp/coverage-reporter/issues/53

:zap: Summary

Add Clover PHP parser

:ballot_box_with_check: Checklist

[coveralls-official[bot]]

Pull Request Test Coverage Report for Build 6048904071

• 38 of 39 (97.44%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 93.719%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/coverage_reporter/parsers/clover_parser.cr	38	39	97.44%
<!--	Total:	38	39	97.44%	-->

Totals
Change from base Build 6035012401:	0.2%
Covered Lines:	940
Relevant Lines:	1003

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💛 - Coveralls

[afinetooth]

Looking good. Thanks, @iurev!

[szepeviktor]

Thank you.