initThisGopPkg: add interface overload method to named

[visualfc]

type NodeSeter interface {
	Len__0() int
	Attr__0(k string, exactlyOne ...bool) (text string, err error)
	Attr__1(k, v string) (ret NodeSeter)
}

*types.Named.Underlying().(*types.Interface) => interface

interface {
	Len__0() int
	Attr__0(k string, exactlyOne ...bool) (text string, err error)
	Attr__1(k, v string) (ret NodeSeter)
}

*types.Named => add overload

method Len(__gop_overload_args__ interface{_()})
method Attr(__gop_overload_args__ interface{_()})

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (01dc571) 95.27% compared to head (db834d5) 95.28%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #327   +/-   ##
=======================================
  Coverage   95.27%   95.28%           
=======================================
  Files          14       14           
  Lines        6483     6489    +6     
=======================================
+ Hits         6177     6183    +6     
  Misses        239      239           
  Partials       67       67           

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