Document steps to expose metrics for EKS-A components

[sp1999]

Issue #, if available:
#7875
#4299
#4405

Description of changes:

• Added documentation on exposing metrics for EKS-A components by configuring a proxy as a Daemonset on the host network. New section is added in observability within cluster management in the EKS-A docs.
• Added design doc for exposing metrics of all EKS-components securely

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.40%. Comparing base (4fe9876) to head (e36f84e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7970   +/-   ##
=======================================
  Coverage   73.40%   73.40%           
=======================================
  Files         577      577           
  Lines       35900    35900           
=======================================
  Hits        26352    26352           
  Misses       7882     7882           
  Partials     1666     1666           

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[jiayiwang7]

/lgtm

[chrisnegus]

Looks good. A lot of my comments were just that we spell out "EKS Anywhere" and "Kubernetes" in public docs.

[jiayiwang7]

/lgtm

[sp1999]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sp1999

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[sp1999]

/cherry-pick release-0.19

[eks-distro-pr-bot]

@sp1999: new pull request created: #8167

In response to this:

/cherry-pick release-0.19

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[sp1999]

/cherry-pick release-0.18

[eks-distro-pr-bot]

@sp1999: new pull request created: #8168

In response to this:

/cherry-pick release-0.18

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