(tree) Added end-to-end test for some basic scenarios in shared tree

[agarwal-navin]

Added some basic end-to-end tests for shared tree. There are a lot of unit tests in the shared tree package and there are examples that use shared tree. However, they are very few tests that use legacy APIs which are primarily consumed by customers using the encapsulated model. Moreover, these tests enable testing real collaboration between clients along with nuances around asynchronous nature of communication between them. These tests create two Fluid clients (containers) and validates that changes made by one client is successfully synced to the other client.

[microsoft-github-policy-service[bot]]

This PR has been automatically marked as stale because it has had no activity for 60 days. It will be closed if no further activity occurs within 8 days of this comment. Thank you for your contributions to Fluid Framework!

[microsoft-github-policy-service[bot]]

This PR has been automatically marked as stale because it has had no activity for 60 days. It will be closed if no further activity occurs within 8 days of this comment. Thank you for your contributions to Fluid Framework!