add "replace" and "upload" functionalities

Created by: liyakun

This pull request includes new features "replace" and "upload" file in the current repository. The "upload" function check the file name conflict(same name check) in the same repository. The "replace" function check the file content conflict(same content check) for the same file.

add replace action

show replace

add replace commit message

add upload view

add upload

show upload

add route for create and update

support replace and upload functionalities

add upload service with commit_message_replace

add support for upload

add "replace" and "upload" functionalities

add "replace" and "upload" test

add test for "replace" and "upload"

change log