refactor(ts): refactor db module to use TS and ESM

[jescalada]

This PR piggybacks on Fabio's TS config PR (#26) to refactor the entire db module (one of the "helper" modules available). I'm working on #18, but I think it's better to refactor on a module-by-module basis. This will avoid headaches with missing files and converting dependent files from CommonJS to ESM.

The PR also fixes configs to enable TS and ESM to work together and execute mocha tests without breaking.

I verified that nothing breaks by running unit tests and also using a Mongo DB cloud instance to test that the converted Mongo module generates the initial user as expected:

Note: Some types are missing and set to any for simplicity. We should fill those in when we add strict TS linting.

Changelog

• Refactor /src/db/mongo to TS and ESM
• Refactor /src/db/mongo to TS and ESM
• Fix mocha not executing properly with TS files

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 59.16667% with 49 lines in your changes missing coverage. Please review.

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Files with missing lines	Patch %	Lines
src/db/file/pushes.ts	48.48%	17 Missing ⚠️
src/db/index.ts	42.85%	11 Missing and 5 partials ⚠️
src/db/file/repo.ts	60.52%	15 Missing ⚠️
src/db/file/users.ts	92.85%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #27   +/-   ##
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  Coverage        ?   51.70%           
=======================================
  Files           ?       48           
  Lines           ?     1671           
  Branches        ?       53           
=======================================
  Hits            ?      864           
  Misses          ?      790           
  Partials        ?       17           

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[jescalada]

PR contents merged in finos#960.