Enhancing the application install and enterprise install mobile application

Purpose

Implementing the enterprise application install for groups and enhancing the Subscription Management API. Related to wso2/product-iots#1688

Implementing the application install and enterprise install APIs and DAO layer.

User stories

https://docs.google.com/document/d/1bkwpaDngEzOP7j3jlJ6mmXLVU1y4TX4YFx_6ICaEr3w/edit?usp=sharing

Application Management subscribe API backend implementation

N/A, Doc will be completed when the UI is completed.

N/A

N/A. Will be sending when the complete application manager.

N/A

N/A

Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
Ran FindSecurityBugs plugin and verified report? yes
Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

N/A

Related PRs

N/A

N/A

N/A