*.: complete checksum statement #703

[hustjieke]

[summary]

1. add [QUICK | EXTENDED] option.
2. fix "checksum/drop TABLE ..." ---> "checksum/drop {TABLE | TABLES} ...".
3. support checksum multi tables.

[test case]
src/planner/others_plan_test.go
src/proxy/checksumtable_test.go

[patch codecov]
src/planner/others_plan.go 91.4%
src/proxy/checksumtable.go 96.9%

[codecov]

Codecov Report

Merging #715 (c221a95) into master (3885e5a) will increase coverage by 0%.
The diff coverage is 89%.

@@          Coverage Diff          @@
##           master   #715   +/-   ##
=====================================
  Coverage      88%    89%           
=====================================
  Files         131    131           
  Lines        9308   9322   +14     
=====================================
+ Hits         8282   8297   +15     
- Misses        679    680    +1     
+ Partials      347    345    -2     

Impacted Files	Coverage Δ
src/planner/others_plan.go	89% <77%> (-4%)	⬇️
src/proxy/checksumtable.go	97% <96%> (+<1%)	⬆️
src/backend/queryz.go	87% <0%> (-4%)	⬇️
src/backend/txn.go	87% <0%> (+<1%)	⬆️
src/backend/xacheck.go	81% <0%> (+1%)	⬆️

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[BohuTANG]

Ping @andyli029 for review

[andyli029]

ACK.

[andyli029]

LGTM