patroni / patroni / 23258543127

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Compatibility with threading changes in python3.11+ (#3526)

Avoid starting/stopping threads in runtime:
1. Always start slot advance thread and CitusHandler thread on Patroni
start.
2. Introduce thread pool for REST API and use it for running REST API
itself and executing incoming HTTP requests.
3. Introduce a global thread pool to execute async tasks and for making
REST API requests during leader race and failsafe checks.
4. Allow configuring global `thread_pool_size` and
`restapi.thread_pool_size`.

Besides that, adjust system(d) start script to run Patroni with
`MALLOC_ARENA_MAX=1` to reduce allocated virtual memory and add
informational warning sections to README.rst and docs.

Close https://github.com/patroni/patroni/issues/3474
Close https://github.com/patroni/patroni/issues/3481

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