* Insert git application metadata to application object, for git sync/version control feature there is a need to save the application in the structured format
* Added changelog to index application collection with git branch and remoteurl
* Rehydrate and dehydrate applications among different instances
* Added serailisation purpose while exporting the application to make distinction between version control and regular import-export flow
* Git file operations moved to appsmith-git module
* Delete json reference from directory for deleted resource in DB
* Added git authentication in application metadata
* Replace String with Path to handle file path in git file structure
