llcppsymg:refine class fetch,test case,-v

[luoliwoshang]

[wip] fix #830

• Refactored the class name retrieval logic, now extracting it by accessing the cursor's semantic parent, and removed redundant logic
• supplement test cases
• Due to the different number of leading underscores in C++ symbols on Linux and macOS, previously removing only the first leading underscore would cause comparison failures on Linux. Therefore, to accommodate both scenarios, we remove remove first leading underscore only in mac
• For paths without -L,llcppsymg attempts to match and retrieve from the default search paths & .so in linux,.dylib in macos
• -v flag
• find dylib&headerfile from mutiple path

linux

• wait os.Readdir to search /etc/ld.so.conf.d 's subdir
• wait exec.Command not panic

It can pass tests normally in both Linux and macOS environments.
However, in actual operation on Linux, the part calling nm throws the following error. Investigation reveals that it's caused by exec.Command. Running cmptest/osexec on Linux also produces the corresponding issue:

root@be00d9b1c2c9:~/llgo/chore/_xtool/llcppsymg# llgo run .
parse dylib symbols from config lib:-L/lib/aarch64-linux-gnu -llua5.4
panic: todo: syscall.Faccessat

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.66%. Comparing base (8419d91) to head (8ad72b1).
Report is 51 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #788      +/-   ##
==========================================
+ Coverage   97.52%   97.66%   +0.13%     
==========================================
  Files          20       20              
  Lines        5775     5812      +37     
==========================================
+ Hits         5632     5676      +44     
+ Misses        123      116       -7     
  Partials       20       20              

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[xushiwei]

should resolve conflicts.

[luoliwoshang]

should resolve conflicts.

resolve conflicts , and need merge the #757 for llcppsigfetch & gogensig

[luoliwoshang]

ready for review. @xushiwei