optimize String() on a typedef if the underlying type is a string

[kishoresenji]

If the underlying type for a defined type is a string, then the Stringer interface implementation can be optimized by returning the string after type conversion.

type UUID string
func (v UUID) String() string {
        x := (string)(v)
        return fmt.Sprint(x)
 }

to

func (v UUID) String() string {
        x := (string)(v)
        return x
 }

[CLAassistant]

All committers have signed the CLA.

[codecov[bot]]

Codecov Report

Merging #554 (9f3eb52) into dev (944fb9f) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #554      +/-   ##
==========================================
+ Coverage   68.00%   68.01%   +0.01%     
==========================================
  Files         139      139              
  Lines       23729    23737       +8     
==========================================
+ Hits        16137    16145       +8     
  Misses       4537     4537              
  Partials     3055     3055              

Impacted Files	Coverage Δ
gen/generator.go	67.23% <100.00%> (+0.18%)	:arrow_up:
gen/internal/tests/services/services.go	61.30% <100.00%> (ø)
gen/internal/tests/typedefs/typedefs.go	68.11% <100.00%> (ø)
gen/internal/tests/uuid_conflict/uuid_conflict.go	63.44% <100.00%> (ø)
gen/type.go	83.50% <100.00%> (+0.52%)	:arrow_up:
gen/typedef.go	100.00% <100.00%> (ø)

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