fix log doesn't show useful filename&lineno

[methane]

Description

In #1563, we added mc.log() helper function that wraps mc.cfg.Logger.Print(). But it broke log.Logger with log.Lshortfile flag. All logs shows connection.go:50.

We need to adjust calldepth. We need to backport this to 1.8 branch or revert #1564 in the branch.

Checklist

• [ ] Code compiles correctly
• [ ] Created tests which fail without the change (if possible)
• [ ] All tests passing
• [ ] Extended the README / documentation, if necessary
• [ ] Added myself / the copyright holder to the AUTHORS file

[coderabbitai[bot]]

Walkthrough

The errors.go file was updated to enhance logging capabilities. A Print method was added to the Logger interface, and a new stdLog type was introduced to wrap the standard log.Logger with an adjusted call depth. Additionally, the defaultLogger variable now uses the StdLogger function to initialize a Logger, improving flexibility and consistency in logging.

Changes

File	Change Summary
errors.go	Added Print(v ...any) to Logger interface, introduced stdLog type, and added StdLogger function to wrap log.Logger with adjusted call depth. Updated defaultLogger to use StdLogger.

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[coveralls]

coverage: 82.499% (+0.04%) from 82.462% when pulling 59497ded6f6487502171448254dcb343f4dc50f4 on methane:fix-callsite into af8d7931954ec21a96df9610a99c09c2887f2ee7 on go-sql-driver:master.

[methane]

I prefer #1589 over this because #1589 can show "filename:lineno" even for custom writers.