feat(anta)!: improve ANTA for high scale NRFU

[mtache]

Description

In some environments where the file descriptor limit of the system is the default (1024 per process) and a lot of tests needs to be performed, the Linux system will refuse to allocate more file descriptor to the ANTA process.

Also improve timeout logging and documentation and fixes #487.

Task list

• Read and print in logs (preferably in DEBUG) the current system ulimit settings
• Investigate the possibility to limit the number of concurrent co-routines to be less than the file descriptors limits on the system and display a warning if this is the case
• Document how to tweak Linux hosts to increase the file descriptor limit
• Improving logging for timeout issues
• Improve this except block to display catch the nested OSError Exception and display a clear ERROR: https://github.com/arista-netdevops-community/anta/blob/main/anta/device.py#L347

Fixes #618
Fixes #487

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have run pre-commit for code linting and typing (pre-commit run)
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes (tox -e testenv)

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[github-actions]

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[gmuloc]

🚢