fix(database/gdb): regular expression pattern for link configuration to be compitable with tidbcloud

[robotism]

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tidb cloud link is like

tidb:2hcmRccccxxx9Fizz.root:wP3xxxxPIDc@tcp(xxxx.tidbcloud.com:4000)/db_name?tls=true

username has a dot 2hcmRccccxxx9Fizz.root

so need update the pattern to (\w+):([^:]*):(.*?)@(\w+?)\((.+?)\)/{0,1}([^\?]*)\?{0,1}(.*)

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the origin pattern is
linkPattern = (\w+):([\w\-\$]*):(.*?)@(\w+?)\((.+?)\)/{0,1}([^\?]*)\?{0,1}(.*)
it is uncompitable with tidb cloud link;

of cause, i can use

- type: "tidb"
  host: "xxxxx
  port: "4000"
  user: "2hcmRccccxxx9Fizz.root"
  pass: "wP3xxxxPIDc"
  name: "db_name"

to instead of the link parameter, it works;

[gqcn]

• It would be better using ^(\w+):(.*?):(.*?)@(\w+?)\((.+?)\)/{0,1}([^\?]*)\?{0,1}(.*?)$ for the pattern.
• Necessary unit testing case should be added for this update here:

  gf/database/gdb/gdb_z_mysql_internal_test.go

  Line 297 in 92eab81

  })

[robotism]

ok, i open a new pr #4064