修复mongo正则匹配与method取值问题

[nick2wang]

处理两个遗留问题：

1. pr 问题:mongodb表名带-和.符号无法申请上线，原因:\w只匹配[a-zA-Z0-9_]，修正:(\w*) -> ([\w\.-]+) #1372 这里对集合名包含特殊符号做了兼容，但是db.getCollection的正则当时没有更新到
   

2. pr 问题: mongodb表名带多个.的情况下, 无法正确截取methodStr. 原因是 默认截取第二个 "." 到"(" 之间的字符串作为method #1381 取method注释描述是对的，但是split顺序反了，导致诸如db.getCollection("abc").remove({})、db.abc.find({}).remove()的语句都无法提交
   

[codecov]

Codecov Report

Base: 75.94% // Head: 75.94% // No change to project coverage 👍

Coverage data is based on head (05a7320) compared to base (287e74a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1973   +/-   ##
=======================================
  Coverage   75.94%   75.94%           
=======================================
  Files          91       91           
  Lines       14319    14319           
=======================================
  Hits        10875    10875           
  Misses       3444     3444           

Impacted Files	Coverage Δ
sql/engines/mongo.py	49.79% <ø> (ø)

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