支持ClickHouse查询

[nick2wang]

支持ClickHouse查询 #1343
暂时只做了查询部分，上线功能后面有时间再做

[codecov]

Codecov Report

Merging #1384 (5fd5b52) into master (ca10a8f) will increase coverage by 0.17%.
The diff coverage is 85.00%.

@@            Coverage Diff             @@
##           master    #1384      +/-   ##
==========================================
+ Coverage   75.39%   75.57%   +0.17%     
==========================================
  Files          81       82       +1     
  Lines       12615    12855     +240     
==========================================
+ Hits         9511     9715     +204     
- Misses       3104     3140      +36     

Impacted Files	Coverage Δ
sql/engines/__init__.py	71.23% <ø> (ø)
sql/models.py	95.64% <ø> (ø)
sql/engines/clickhouse.py	71.20% <71.20%> (ø)
sql/engines/tests.py	99.83% <100.00%> (+0.01%)	⬆️

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[LeoQuote]

牛逼, 感谢贡献

[hhyo]

已合并，文档和readme也可以补充下

[nick2wang]

已合并，文档和readme也可以补充下

wiki和readme已更新