Prototype basic local network implementation using tmpnet

[meaghanfitzgerald]

Goal

This Issue is dependant on #2509

Utilize tmpnet service in avalanche network start with a simple default network configuration.

Assumptions and Scope

• Tmpnet can be used in place of ANR to simple start a local network of 2 nodes.
• This does not need to include an L1, just a local copy of the primary network

Example Usage

avalanche network start --tmpnet

Notes

• Do not replace any avalanche network functionality. Simply mirror the functionality in the command and enable tmpnet with a flag for now. Once this simple implementation is working and thoroughly tested,

Open Questions

• NA