RFC: reset TiKV to some certain mvcc snapshot#81

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longfangsong wants to merge 5 commits intotikv:masterfrom longfangsong:patch-1

+103

Commits on Nov 26, 2021

Create 0081-flashback.md
longfangsong
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Commits on Dec 3, 2021

rename flashback into truncate
longfangsong
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Commits on Dec 6, 2021

Update text/0081-truncate.md
longfangsong
committed
add some note about no more write requests should be sent to TiKV during the truncate process
longfangsong
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Commits on Dec 10, 2021

address comments
longfangsong
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