lightning/restore: support ingset multi ssts for same range (#1089)

[ti-chi-bot]

This is an automated cherry-pick of #1089

What problem does this PR solve?

Ingest multi SST files (different CF) together to gain better consistency. This can resolve the problem that lighting import or BR restore may cause TiFlash panic.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has interface methods change

Side effects

Related changes

• Need to cherry-pick to the release branch

Release Note

• No Release Note

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved (/lgtm + /merge) by the collaborators.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

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[lonng]

@glorv Do we need to cherrypick this PR into release 4.0?

[ti-chi-bot]

@ti-chi-bot: PR needs rebase.

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