Co-authored-by: Lauris BH <lauris@nix.lv>

Following on from #11008 refactor UpdateOAuth2Application

* add API endpoint to create OAuth2 Application.

* move endpoint to /user. Add swagger documentations and proper response type.

* change json tags to snake_case. add CreateOAuth2ApplicationOptions to swagger docs.

* change response status to Created (201)

* add methods to list OAuth2 apps and delete an existing OAuth2 app by ID.

* add APIFormat convert method and file header

* fixed header

* hide secret on oauth2 application list

* add Created time to API response

* add API integration tests for create/list/delete OAuth2 applications.

Co-authored-by: techknowlogick <matti@mdranta.net>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>

Signed-off-by: Tamal Saha <tamal@appscode.com>

* display ui time with customize time location

* fix lint

* rename UILocation to DefaultUILocation

* move time related functions to modules/timeutil

* fix tests

* fix tests

* fix build

* fix swagger

* Add oauth2 grants ui

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add delete functionality
Add translations

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix unit tests

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix unit tests

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Refactor DeleteOAuth2Grant
Use results.Close()

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Refactor DeleteOAuth2Grant (again)

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Check if user ID is zero

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Check if grant ID is zero

Signed-off-by: Jonas Franz <info@jonasfranz.software>