feat:overload function anchor info by func.Doc

[luoliwoshang]

#11

• Passing overload information in func.Doc
• The anchor point of an overloaded function consists of an index and a function name.
• corresponding test function

option 1
use function synopsis as the anchor to achieve the correct overloaded function jump。
1. But in doing so, the link to the anchor of the method will be very long
Consider hashing the signature
option 2
Modify the doc.Func and doc.Item types to add overloaded indexes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.90%. Comparing base (717e2d1) to head (8ddd82d).
Report is 14 commits behind head on goplus.

Additional details and impacted files

@@            Coverage Diff             @@
##           goplus      #12      +/-   ##
==========================================
+ Coverage   55.85%   55.90%   +0.05%     
==========================================
  Files         161      161              
  Lines       16209    16230      +21     
==========================================
+ Hits         9053     9074      +21     
  Misses       6332     6332              
  Partials      824      824              

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