new_owner: a owner implement, the owner is a manager of changefeeds (#1909)

[ti-chi-bot]

This is an automated cherry-pick of #1909

What problem does this PR solve?

a owner implement, the owner is a manager of changefeeds

the owner implements the Reactor interface, Etcd worker driver the owner tick by tick.
the owner's responsible for starting/stopping the changefeed and send admin job to the changefeed

Check List

Tests

• Unit test
• Integration test

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.

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[sre-bot]

No release note, Please follow https://github.com/pingcap/community/blob/master/contributors/release-note-checker.md

[zier-one]

merged by #2123