E2e tested openapi spec with swagger endpoint

[pragmaxim]

What this PR adds and fixes, see api.md :

1. openapi.yaml and swagger-ui
2. e2e in typescript, not in golang anymore, simpler, leaner, openapi native, clients like trezor-suite use it including blockbook-api.ts that should be compatible with openapi.yaml, TS compiler can check it
3. e2e were wrongly mixed together with integration tests, it got separated
4. CI/CD verifies blockbook-api.ts is up to date and validated against openapi.yaml by TS compiler !!!

• Drawback - package-lock.json for the dependencies around Openapi and Swagger is ~ 4000 LOC
• This is a way how to make PRs with API changes without some obscure communication issues

Unfortunately there is no way to generate openapi.yaml since blockbook api does not use any modern frameworks, however we keep it unified with blockbook-api.ts generated from the golang types ... that will provide enough for trezor-suite to integrate againts.