adding use_oneshot parameter to speed up check runs with psutil.Process().oneshot()

[mrafi97]

What does this PR do?

This check adds a bool parameter use_oneshot that can be set to true so that the check uses psutil.Process().oneshot() (https://psutil.readthedocs.io/en/latest/#psutil.Process.oneshot) to cache metrics and have a ~2x speed up of the check run.

This defaults to true so that users are using the quicker/more efficient version of the check.

Motivation

https://datadoghq.atlassian.net/browse/WINA-805

Additional Notes

From psutil docs: https://psutil.readthedocs.io/en/latest/#psutil.Process.oneshot

The advice is to use this every time you retrieve more than one information about the process.

With this in mind we have set use_oneshot to be true by default since the check runs the psutil.Process methods often. So far this was tested through ddev on a Windows Laptop and a Linux container.

Benchmark results:

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Changelog entries must be created for modifications to shipped code
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

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[codecov]

Codecov Report

Attention: Patch coverage is 96.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.92%. Comparing base (32b11da) to head (6bb8ac3).
Report is 59 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
hive	?
hivemq	?
ignite	?
jboss_wildfly	?
kafka	?
presto	?
process	85.61% <96.66%> (+0.61%)	⬆️
solr	?

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