[P2P] Simplify P2P module implementation

[jessicadaugherty]

Objective

Simplify the libp2p module implementation by refactoring the Transport and Network interfaces.

Origin Document

Next steps identified in #500

Goals

• Reduce the complexity of the Transport and Network interfaces

Deliverable

• Refactor the Transport and Network interfaces to improve readability
• Consider renaming the Network object to better reflect its behavior as a Router but keep in mind that it may be replaced with a "raintree pubsub router" in future iterations

Non-goals / Non-deliverables

• Adding new functionality to the LibP2P integration

General issue deliverables

• Update the appropriate CHANGELOG
• Update any relevant READMEs (local and/or global)
• Update any relevant global documentation & references
• If applicable, update the source code tree explanation
• If applicable, add or update a state, sequence or flowchart diagram using mermaid

Testing Methodology

• All tests: make test_all
• LocalNet: verify a LocalNet is still functioning correctly by following the instructions at docs/development/README.md

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Creator: @jessicadaugherty
Co-owner: @bryanchriswhite

[jessicadaugherty]

@bryanchriswhite @Olshansk this is ready for review

[bryanchriswhite]

Looks good to me 👍