perf: Add automatic detection of memory limits

[SuperQ]

What this PR does / why we need it:
Add automatic detection of container and system memory limits to control the Go GOMEMLIMIT garbage collector feature. This helps reduced OOMs by triggering GC when the process approaches system limits.

How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality)
N/A

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[SuperQ]

We added this to Prometheus (prometheus/prometheus#13395) and it helps a lot in our production environment.

[mrueg]

Thanks, looks interesting!
I would suggest to introduce it as an experimental feature.

[mrueg]

Ah can you run make generate to fix the docs? Thanks!

[SuperQ]

Updated docs.

[mrueg]

Looks like the lint is still complaining about a the wrong format for the auto gomemlimit ratio

[mrueg]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mrueg, SuperQ

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[CatherineF-dev]

qq: Will cpu increase a lot if GC is triggered frequently?