* implement get channels endpoints and updated drivers and unittests
* removed channel deletion on tear down, removed manage permission on get channels endpoints, and updated utils to add constant channel length
* added constants for user, team and channel length, updated context to use the model functions
* make sure team name length should be less than the minimum length and revert underscore to team name validity
* changed post test condition from notfound to unauthorized
* PLT-5277 - Adjusting textbox on tablet view
* PLT-5277 - Adjusting text area on mobile view
* PLT-5097 - Updating styles for remove image
* PLT-5217 - Updating styles for mobile code block
* PLT-5470 - Timestamps not visible on dark theme
* Implement POST /posts endpoint for APIv4
* Implement GET /channels/{channel_id}/posts endpoint for APIv4
* Implement GET /posts/{post_id} endpoint for APIv4
* Implement GET /posts/{post_id}/thread endpoint for APIv4
* Skip team get if it's a DM channel in handlePostEvents
* PLT-5277 - Adjusting textbox on tablet view
* PLT-5277 - Adjusting text area on mobile view
* PLT-5097 - Updating styles for remove image
* PLT-5217 - Updating styles for mobile code block
* Adding go vet to the api package
* Adding go vet to app package
* Adding go vet to manualtesting package
* Adding go vet to the model package
* Adding go vet to the store dir
* Adding go vet to utils package
* Adding missing dirs with go files
* Fixing up makefile
* Fixing up makefile
* Removing root dir
* added get user by username endpoint
* added get user by username unit test and driver
* changed username length to 22 characters max
* changed Params to UserName to Username
* reorganized get user by username and get user by email formatting in model/client4
* Implement GET /channels/{channel_id}/members
* Implement GET /channels/{channel_id}/members/{user_id} endpoint for APIv4
* Implement /users/{user_id}/teams/{team_id}/channels/members endpoint for APIv4
* Fix unit test
* Implement GET /teams/{team_id} endpoint for APIv4
* Implement GET /users/{user_id}/teams endpoint for APIv4
* Implement GET /teams/{team_id}/members/{user_id} endpoint for APIv4
