Add new compiler flag to skip directories

[emnul]

This PR is part of #366

We're not actively maintaining contracts archive folder, so there's no need to compile files in that folder during the build process. However, at this time we compile all files in the src directory by default. We could enumerate all directories except the archive directory in our package.json scripts, but it's error prone and does not scale.

This PR adds a new compiler flag to the compact compiler tool that would allow us to specify directories to skip over during the compilation process solving the pain point described above

TODO:
[ ] - Add tests

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch add-filter-dir-option

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[0xisk]

@emnul I think this PR solves it: OpenZeppelin/compact-tools#68 could you confirm?