server.api add api for history_hot_region info;server.cluster add storage for hot region;sever.config add 'hot-regions-reserved-days' and 'hot-region-write-interval'

[qidi1]

What problem does this PR solve?
Store hot-region information regularly
Provide api interface for requesting historical hot-region information
What is changed and how it works?
By introducing part of the heartbeat processing logic in the client of region_syncer, unnecessary saveKV operations are reduced.

• Notable feature additions
  Add history hot region info store and request for it
• API changes
  Add a post method,api is /hotspot/regions/history
  Check List

Tests

Unit test

Code changes

Side effects

Related changes

Release note

[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.

[ti-chi-bot]

@qidi1: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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.

[qidi1]

some code is confict,so i close this push request and push a new push request