Add collector to collect tidb information in kubernetes cluster

[hanlins]

What problem does this PR solve?

Added a tool for collecting tidb-related information in a kubernetes cluster.
Fixes #4686

What is changed and how does it work?

No changes on existing code base, added a dedicated binary to collect information in kubernetes cluster.

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has not been approved.

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #4689 (686d954) into master (b84b18b) will increase coverage by 5.98%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4689      +/-   ##
==========================================
+ Coverage   63.58%   69.56%   +5.98%     
==========================================
  Files         196      200       +4     
  Lines       21315    23848    +2533     
==========================================
+ Hits        13554    16591    +3037     
+ Misses       6537     5994     -543     
- Partials     1224     1263      +39     

Flag	Coverage Δ
e2e	48.64% <ø> (?)
unittest	63.57% <ø> (-0.02%)	⬇️

[ti-chi-bot]

@hanlins: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.