schema storage shallow copy DBInfo (pingcap#3085)

* schema storage shallow copy DBInfo

Signed-off-by: sdojjy <[email protected]>

* schema storage shallow copy DBInfo

fix ErrSnapshotLostByGC message (pingcap#3083) (pingcap#3090)

ddl-puller: use standard context and pass changefeed, table info (pin…

…gcap#3020) (pingcap#3045)

metrics: add data flow metrics (pingcap#2763) (pingcap#2831)

server: when init data dir, skip if get changefeed info failed. (ping…

…cap#2778) (pingcap#2787)

* This is an automated cherry-pick of pingcap#2778

Signed-off-by: ti-chi-bot <[email protected]>

* fix conflicts

Signed-off-by: Neil Shen <[email protected]>

Co-authored-by: Ling Jin <[email protected]>
Co-authored-by: Neil Shen <[email protected]>

sink: fix codec json encoding with non binary string (pingcap#2764)

tests: fix unstable integration_test gc_safepoint (pingcap#2717) (pin…

…gcap#2740)

pipeline: set table status to stopped after sink is closed (pingcap#2716

)

owner: fix gc safepoint larger by one (pingcap#2647)

owner: fix gc safepoint larger by one (pingcap#2647)