DeploymentItem should be implemented via Fx extensibility

[AbhitejJohn]

Description

Deployment Item currently is hard-coded into the adapter's core platform service leading to a bunch of dependency issues with discovery in projects targeting UWP. This should truly be separated out as a separate module so that:

1. Deployment as a pillar is extensible to anyone wanting to have their own custom deployment.
2. The design as such is clean, since this is specific only to certain platforms.

[Evangelink]

I will close this issue because it's not really clear what we want to do and also I believe this deployment functionality should be removed as it can be provided by msbuild or initialize methods.

[Youssef1313]

#6851 is related to the ask here.