Add support for all the account related functionalities using couchbase to extend offline support in the application

[varsvat]

Fixes #FINCN-335

Adding support for following functionalities in Account section:

• Create a new Account
• Edit an existing Account
• Account details Screen
• Account Task management features such as locking, reopening, closing, etc.
• Add all the above features replacing the API interaction with the Couchbase interaction to extend offline support in the application
• Also replaced the existing MVP architecture with MVVM architecture recommended by Google itself

Please Add Screenshots If any UI changes.

Couchbase-server :

Sync-gateway :

accountdetails.mp4

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[varsvat]

@jawidMuhammadi @therajanmaurya Please review this PR whenever you get time.