[P2P] Move `Peerstore` interface to a module-shared pkg

[bryanchriswhite]

Objective

Support usage of the Peerstore interface type in (sub)module method signatures while preventing import cycles.

Origin Document

Observation made while working on #732 & #855. In order to complete the peerstore provider refactor as a submodule the Peerstore type needs to be moved to avoid creating an import cycle between the p2p/types package and the shared/modules package.

Goals

• Avoid import cycle on Peerstore.

Deliverable

• Move the Peerstore interface from p2p/types/peerstore.go to a shared/core/types (or similar / more appropriate)

Non-goals / Non-deliverables

• Unrelated refactoring

General issue deliverables

• Update the appropriate CHANGELOG(s)
• Update any relevant local/global README(s)
• Update relevant source code tree explanations
• Add or update any relevant or supporting mermaid diagrams

Testing Methodology

• All tests: make test_all
• LocalNet: verify a LocalNet is still functioning correctly by following the instructions at docs/development/README.md
• k8s LocalNet: verify a k8s LocalNet is still functioning correctly by following the instructions here

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Creator: @bryanchriswhite