Oleg Ovcharuk

WIP: Alter topic docs for python sdk

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### Changelog entry Docs fo implemented `alter_topic` feature on Python SDK ### Changelog category * Documentation (changelog entry is not required) ### Additional information Relies on https://github.com/ydb-platform/ydb-python-sdk/pull/448

Ability to batch messages in topic reader

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## Pull request type Please check the type of change your PR introduces: - [ ] Bugfix - [ ] Feature - [ ] Code style update (formatting, renaming) -...

reduce slo docker image size

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## Pull request type Please check the type of change your PR introduces: - [ ] Bugfix - [ ] Feature - [ ] Code style update (formatting, renaming) -...

## Pull request type Please check the type of change your PR introduces: - [ ] Bugfix - [x] Feature - [ ] Code style update (formatting, renaming) - [...

Add python 3.9 to tests matrix

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## Pull request type Please check the type of change your PR introduces: - [ ] Bugfix - [ ] Feature - [ ] Code style update (formatting, renaming) -...