Add ability to run python SDK tests using YT docker containers

[dmi-feo]

For now it requires yt binaries available: YtTestEnvironment runs YtInstance which executes YT binaries in order to get a running YT instance.

Let's add an ability to run the tests without YT binaries, using only public docker images. The option of running with the binaries should remain, for sure.

Likely it is also required to implement testcontainer since some tests launch several YT instances right from their code, so it would be too tricky to go with just docker-compose.