planner/core: support limit push down (#24757)

[ti-srebot]

cherry-pick #24757 to release-5.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/25159

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git push git@github.com:ti-srebot/tidb.git pr/25159:release-5.0-64b469623c87

---

What problem does this PR solve?

Problem Summary:
Let mpp support limit

What is changed and how it works?

What's Changed:
let optimizer consider push limit down to tiflash.

Check List

Tests

• Unit test

Release note

• planner/core: support limit push down

[ti-srebot]

/run-all-tests

[ti-srebot]

@hanfei1991 you're already a collaborator in bot's repo.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• qw4990
• xiongjiwei

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[hanfei1991]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 6677ba3

[ti-chi-bot]

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