refactor: Refactor service module to TS + ESM

[jescalada]

Fixes #1062.

This PR is built on top of #977 which should merged first (and is ready to merge!).

Note that some .post requests use res: any instead of res: Response. For some reason, when using res: Response, I was getting this (unhelpful) error:

No overload matches this call.
  The last overload gave the following error.
    Argument of type '(req: Request, res: Response) => Promise<express.Response<any, Record<string, any>>>' is not assignable to parameter of type 'Application<Record<string, any>>'.
      Type '(req: Request<ParamsDictionary, any, any, ParsedQs, Record<string, any>>, res: Response<any, Record<string, any>>) => Promise<...>' is missing the following properties from type 'Application<Record<string, any>>': init, defaultConfiguration, engine, set, and 63 more.ts(2769)

I have no idea why it seems to require the type Application (from the Express library), but when setting it to type any the endpoints work as they used to.

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[codecov]

Codecov Report

Attention: Patch coverage is 61.27660% with 182 lines in your changes missing coverage. Please review.

Project coverage is 77.27%. Comparing base (75fb0e6) to head (f57b1a1).

Files with missing lines	Patch %	Lines
src/service/routes/push.ts	16.90%	58 Missing and 1 partial ⚠️
src/service/routes/repo.ts	61.03%	24 Missing and 6 partials ⚠️
src/service/routes/users.ts	20.00%	24 Missing ⚠️
src/service/passport/ldaphelper.ts	27.27%	16 Missing ⚠️
src/service/passport/oidc.ts	35.00%	13 Missing ⚠️
src/service/passport/jwtAuthHandler.ts	69.69%	4 Missing and 6 partials ⚠️
src/service/passport/activeDirectory.ts	63.15%	5 Missing and 2 partials ⚠️
src/service/passport/jwtUtils.ts	87.17%	3 Missing and 2 partials ⚠️
src/service/index.ts	90.69%	2 Missing and 2 partials ⚠️
src/service/routes/config.ts	66.66%	4 Missing ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1063      +/-   ##
==========================================
+ Coverage   76.78%   77.27%   +0.49%     
==========================================
  Files          55       54       -1     
  Lines        2261     2187      -74     
  Branches      251      342      +91     
==========================================
- Hits         1736     1690      -46     
+ Misses        495      445      -50     
- Partials       30       52      +22     

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[jescalada]

By the way, @06kellyjac, the OIDC is still working correctly after your passport changes 👍🏼

I tried merging in your ActiveDirectory additions and refactoring them into TS, but I'm not sure if they work 100% as intended. Would appreciate a quick look at this to make sure!