Revert "Totally removed all uses and dependencies on Microsoft.Composition package."

This reverts commit 721d37a6f07e9dd736bf8359c03e51106a6778ee.

Conflicts:
	src/IronPigeon/OwnEndpointServices.cs
Revert "Fixes several build warnings."

This reverts commit 32191211b2dfa43a96ce5d71f57553a9aa484a03.
Revert "Adds autofac as a composition option for IronPigeon users."

This reverts commit fbcf0616c86bb150cf0f4ea83a721baff467247d.
Fixes project format break.
Increments version.
Adds back a property that's useful for Autofac folks.
Removes Autofac from IronPigeon, since it's incompatible with iOS.