[Reputation Oracle] refactor: common folder cleanup

[dnechay]

Tip

It might be easier to review it commit-by-commit for some parts

Issue tracking

Part of #3084

Context behind the change

• existing e2e removed because not used; we might want set up it later from scratch
• no need in app.controller, we have specific routes
• SnakeCaseInterceptor refactored to TransformInterceptor so it's clear that it's used for transforming request/response; also made case transformers clear by refactoring code, adding unit tests and removing implicit logic on date. toISOString
• deleted unused constants, types, functions, etc.
• some regrouping done to index.ts files instead of separate "one function file", so now we keep it simple, later can group things if they appear
• simplified the flow where we accept enum values in any case from HTTP layer; it wasn't enabled before, now done via simple decorators; left some todos for later
• utils now live in separate folder for better visibility, so people can notice them and check if there is some existing tool already
• introduced some common testing utilities in test/mock-creators; later would be nice to have fixtures there already

How has this been tested?

• running service locally and triggering endpoints to make sure case transformation and enums validation works e2e
• existing unit tests pass for modules where code reorganization took place
• new unit tests pass

Release plan

Test & merge

Potential risks; What to monitor; Rollback plan

Should be no risks. The only new change is related to values case transformation, but it extends APIs, not reduces what they acceps.

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