Have case list in text format describing object tests being conducted

[cthulhu-rider]

Is your feature request related to a problem? Please describe.

im always frustrated when i need to realize which cases are not covered, which are covered, and whether their expectations are correct. Some NeoFS services can have many possible settings. Object SearchV2 is one of them

currently, to do this, i need to go to a specific .py file and integrate the code

Describe the solution you'd like

have a text file with list of tests. Refer test funcs in code to them

for example, for SearchV2, each item describes:

1. what data is prestored
2. what is being requested
3. what response is expected
4. CLI cmd to make the request (*)

(*) this will make it easier to understand whether the cmd matches the request, and if so, to reproduce it

Describe alternatives you've considered

write the same info in comments to test functions in source code. Will still require to surf .py files, but better than nothing

Additional context

• tests: add tests for searchv2 #953