feat: add Support MultiProcess Collector for Prometheus

[Peopl3s]

Description

Add Support MultiProcessCollector for BasePrometheusMiddleware

Close #2220

Type of change

• New feature (a non-breaking change that adds 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

[CLAassistant]

All committers have signed the CLA.

[roma-frolov]

Thank you very much for your contribution!

We would be happy to accept it, but there are a couple of questions:
Is it really necessary to add support for multiprocess metrics to FastStream Middleware?
Following the documentation it is possible to make this support without changes in FastStream.
To make the support work, you just need to specify the environment variable PROMETHEUS_MULTIPROC_DIR (the folder where prom will save data) and write in your code:

registry = CollectorRegistry()
multiprocess.MultiProcessCollector(registry, path=path)

If we suddenly decide that this change in FastStream is really unnecessary, then maybe you can update the documentation so that users can refer to something to implement multiprocess metrics support in their own?

[Peopl3s]

If we suddenly decide that this change in FastStream is really unnecessary, then maybe you can update the documentation so that users can refer to something to implement multiprocess metrics support in their own?

@roma-frolov Yeah, sure.

[Peopl3s]

Add #2275 @Lancetnik @roma-frolov

[Lancetnik]

I think, we can close this one then