MSys support and related improvements

[maxirmx]

• Windows/MSys workflow
• Updated dwarfs version that supports Windows/Msys
• Ruby integration tests on Windows
• MacOS runners update to 11.0 (BigSur)
• CodeQL workflow
• Coverity workflow
• Test coverage

[codecov-commenter]

Codecov Report

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  Coverage        ?   77.59%           
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  Lines           ?     1727           
  Branches        ?        0           
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  Hits            ?     1340           
  Misses          ?      387           
  Partials        ?        0           

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[maxirmx]

@ronaldtse This is a MSys-compatible dwarfs access layer. Upstream I can reliably package simple gems but not metanorma project yet. However, I would like to merge it into main since this version contains a lot of improvements and fixes.

[ronaldtse]

Let’s do it. Thank you!