fix: mime-types and max-file-size

[fenos]

What kind of change does this PR introduce?

Bug fix

What is the new behavior?

• Allow null for file_size_limit and allowed_mime_types
• Add more strict validations on mime types

[coveralls]

Pull Request Test Coverage Report for Build 4665820230

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report.
To ensure accuracy in future PRs, please see these guidelines.
A quick fix for this PR: rebase it; your next report should be accurate.

• 57 of 93 (61.29%) changed or added relevant lines in 7 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 84.177%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/http/routes/tus/lifecycle.ts	6	8	75.0%
src/storage/uploader.ts	26	32	81.25%
src/storage/storage.ts	12	40	30.0%

Files with Coverage Reduction	New Missed Lines	%
src/storage/storage.ts	1	80.19%

Totals
Change from base Build 4655784878:	-0.3%
Covered Lines:	7026
Relevant Lines:	8283

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💛 - Coveralls

[github-actions]

🎉 This PR is included in version 0.37.1 🎉

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