Add Open App Store & Notify App Install Completed Capability

[YinHang2515]

Description

This pr is meant to enable open app store and notify apps installation capability, including several types of store dialogs, like full store, in-context-store. The store will leverage current dialog capability.

Main changes in the PR:

1. store.ts - add open store api, performing function of sending message to host sdk
2. store.spec.ts - related unit test

Validation

Validation performed:

1. start teams test app
2. search Store section and check
3. the acture store view cannot be accessed as host sdk not updated

Unit Tests added:

Yes

End-to-end tests added:

No

Additional Requirements

Change file added:

Yes

Next/remaining steps:

• Enable a new api that notify when finish installing apps
• Integrage those 2 apis to each hubs

Screenshots:

Remove this section if n/a

Before	After
None, as this is a new added feature

[github-actions]

This pull request contains changes to the runtime.ts file. If you, as the author of this PR, have made changes to the Runtime interface please review RUNTIME.md to determine if a new runtime version is required. Please reply to this comment stating what changes, if any, were made to the runtime object and whether a new runtime version was required.