improve p2p host connection manager, remove quic transporters

[GheisMohammadi]

Issue

This PR improves p2p host connection manager and removes QUIC transporters from p2p host.

[Frozen]

WithSilencePeriod sets the silence period.
The connection manager will perform a cleanup once per silence period
if the number of connections surpasses the high watermark.

[Frozen]

WithGracePeriod sets the grace period.
The grace period is the time a newly opened connection is given before it becomes
subject to pruning.

[Frozen]

What is our current "high watermark"?

[Frozen]

You have to merge this one as well to pass tests.

[GheisMohammadi]

What is our current "high watermark"?

192