Add ability to set 'swaggerignore' on embedded fields

[ffenix113]

Describe the PR
This PR adds ability to set swaggerignore:"true" on embedded fields.

Relation issue
#632

Additional context
Currently swaggerignore supports only ignoring named fields, while in some cases it is also useful to be able to ignore embedded fields.

[codecov]

Codecov Report

Merging #779 into master will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #779      +/-   ##
==========================================
+ Coverage   82.16%   82.20%   +0.04%     
==========================================
  Files           8        8              
  Lines        1744     1748       +4     
==========================================
+ Hits         1433     1437       +4     
  Misses        193      193              
  Partials      118      118              

Impacted Files	Coverage Δ
parser.go	77.24% <100.00%> (+0.10%)	⬆️

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[ffenix113]

@easonlin404 @sdghchj @pei0804 Could you please review guys?

[easonlin404]

Looks good for me. @sdghchj Could you help review as well?

[sdghchj]

It's OK

[easonlin404]

@ffenix113 Thanks for your contributions. 👍