feat(multiprocess): restart child processes if they are not alive

[gostilovichd]

Description

Restart child processes in MultiProcessor if the child process terminates for any reason. In our case a process was killed by oom-killer and the faststream app stopped processing events from Kafka.

Fixes # (issue number)

#1059

Type of change

Please delete options that are not relevant.

• Documentation (typos, code examples, or any documentation updates)
• Bug fix (a non-breaking change that resolves an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (a fix or feature that would disrupt existing functionality)
• This change requires a documentation update

Checklist

• My code adheres to the style guidelines of this project (scripts/lint.sh shows no errors)
• I have conducted a self-review of my own code
• I have made the necessary changes to the documentation
• My changes do not generate any new warnings
• I have added tests to validate the effectiveness of my fix or the functionality of my new feature
• Both new and existing unit tests pass successfully on my local environment by running scripts/test-cov.sh
• I have ensured that static analysis tests are passing by running scripts/static-analysis.sh
• I have included code examples to illustrate the modifications

[Lancetnik]

Probably we can use smth like not all((p.is_alive() for p in process))? It looks much explicit for me

[gostilovichd]

I agree, it looks better. Fixed

[Lancetnik]

Thank you a lot for contribution and for the framework using! Sorry for waiting for so long (I had a vacation this time)