refactor: generate gorm default tag (go-gorm#433)

* refactor: generate gorm default tag

fix: int default tag without quote

fix: remove zero value default tag

style: remove tag's verbose space

WIP: feature generate from object (go-gorm#407)

* chore(examples): only generate model

* feat: generate from object

* feat(generate): optimize generated tag

* feat: remove verbose method

* feat: optimize filename

* feat: add FileName on Object

chore(deps): go module tidy up

fix: count without offset in FindByPage

feat: implement returning

style: format