Add composer.json file to DataModel component

Change-Id: I312993b8ff94bb99ea86e59a9f744f2b13c0c717
Added composer.json file to the Database component

Change-Id: Ibab6dc7cd53d27eeeaca8ff87ddb54702b8626da
Added composer.json to the QueryEngine component

Change-Id: I266bce01ac580644c424959a50198b0cc7046fa3
Merge "Add composer.json file to DataModel component"
Merge "Added composer.json file to the Database component"
Merge "Added composer.json to the QueryEngine component"