feat: API-first approach for REST interface

[0xERR0R]

Motivation and detailed description: see #808

short summary:

• API specification with OpenAPI standard (yaml file under docs/api)
• We generate server stub and REST client from this OpenAPI file
• Implementation of server stub
• CLI commands use generated REST client
• OpenAPI and RapiDoc UI are embedded in final binary and are accessible from index.html
• Documentation (GitHub pages) provides OpenAPI and RapiDoc

closes #808

[codecov]

Codecov Report

Patch coverage is 81.53% of modified lines.

Files Changed	Coverage
resolver/blocking_resolver.go	12.50%
server/server.go	45.45%
server/server_endpoints.go	77.96%
cmd/blocking.go	78.37%
cmd/lists.go	87.50%
api/api_interface_impl.go	92.64%
cmd/query.go	93.33%
cmd/root.go	100.00%
lists/list_cache.go	100.00%
resolver/resolver.go	100.00%

📢 Thoughts on this report? Let us know!.

[kwitsch]

This declutters the API implementation quite a bit. I like it. 👍

Read through it and couldn't find a flaw so far.

Sadly I'm currently still unable to test it locally. 😓

[0xERR0R]

Sadly I'm currently still unable to test it locally. 😓

No local dev environment installed? I used recently github codespaces and it works great. You need only a browser.

[kwitsch]

Sadly I'm currently still unable to test it locally. 😓

No local dev environment installed? I used recently github codespaces and it works great. You need only a browser.

No free time to sit behind my computer.
I'm writing and reading mostly with my mobile phone on a construction site or while riding train.
Should get better in two or three weeks since construction is nearly complete and most business trips are done (getting a promotion at work could have it's downsides😅).