[CHORE] Move swagger responses to separate package

[KostLinux]

Description

The suggestion is to move swagger-related responses to a separate package to not mess up with code logic. They are models, with which I agree; however, they have nothing to do with code logic. Those response models are needed for swagger documents only.

Depends on #16 #15 due to my master branch is up to date

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas (optional)
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• My changes generate no new warnings
• I've performed/added tests/lints that prove my fix is effective or that my feature works (optional)

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[Matrix278]

@KostLinux I would not make this, as the models not only for swagger, but actually used for error http responses. The only model I could see for using it currently is UserByIDResponseSwagger. But I guess it won't make much sense to put only this one model there, as I wanted to fix this issue with strfmt.UUID4 to remove it.

[KostLinux]

Okay.. 🤔