[Core] [P2P] Support inbound connections to non-validator staked actors

[bryanchriswhite]

Objective

Support inbound connections to non-validator staked actors (i.e. servicers, fishermen, applications). These actors currently have an inconsistent (or nonexistent) representation and/or meaning of "service URL", which has been used in the validator context as the P2P endpoint.

Origin Document

(see: #only-stupid-questions conversation for more context)

Goals

• Determine if the meaning of service URL should be consistent across actor types
• Align the meaning and format of all staked actors' P2P endpoints
• Facilitate more robust network bootstrapping

Deliverable

• [ ] Fix DNS resolution in localnet for fishermen & servicer hostnames in genesis (applications too if applicable)
• [ ] Update affected actors models / service URL
• [ ] Update genesis

Non-goals / Non-deliverables

• ...

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

[Olshansk]

We have more details in #555 but as an extra datapoint, service_url is not applicable to Application actors.

string service_url = 5; // Not applicable to `Application` actors