Add docker volumes

[RLKRo]

Description

Add docker volumes for context storages to persist contexts after docker restart.

Adding tests for that would be difficult (due to the need to restart containers) but I tested that it works in codespaces and locally.

Although locally I have an issue with running ydb after adding volumes:

dff-ydb-1    | Caught exception: (No such file or directory) util/system/file.cpp:857: can't open "/ydb_certs/ca.pem" with mode RdOnly|Seq (0x00000028)

The issue is not present in codespaces (possibly due to clean environment).

UPD: removing ydb volumes and images and running again solves the issue.

Also, this PR removes names for stats volumes (I don't understand why we need them).

Checklist

• I have covered the code with tests
• I have added comments to my code to help others understand it
• I have updated the documentation to reflect the changes
• I have performed a self-review of the changes