change(network-params): Configurable Testnet funding streams

[arya2]

Motivation

We want configurable funding streams to test consensus rule changes in NU6.

Closes #8367.

Depends-On: #8723.

Solution

• Moves subsidy.rs from zebra-consensus to zebra-chain
• Moves funding_stream_address_period() fn to zebra-chain
• Refactors funding stream information into structs
• Splits funding streams into pre/post NU6 funding streams
  • Adds expected height ranges for post-NU6 funding streams with empty recipients list
• Adds a funding_streams field on testnet::Parameters

Related changes:

• Returns early from is_regtest() after checking the network magic
• Moves funding stream receiver names to a method
• Adds missing #[serde(deny_unknown_fields)] on Testnet parameters struct in zebra-network config deserialize impl

Tests

This PR adds a vector test for the constraints on ParametersBuilder::with_funding_streams() setter methods and updates the v1.9.0 stored config.

PR Author's Checklist

• The PR name will make sense to users.
• The PR provides a CHANGELOG summary.
• The solution is tested.
• The documentation is up to date.
• The PR has a priority label.

Follow Up Work

Move the zebra_consensus::block::subsidy module to zebra-chain.

PR Reviewer's Checklist

• The PR Author's checklist is complete.
• The PR resolves the issue.

[oxarbitrage]

Looks good, i think we can clarify some of the block numbers maybe adding them as constants so we can change them more easy.

[oxarbitrage]

Thanks for the updates.

[conradoplg]

Left some comments, also, are the TODOs added supposed to be addressed in a later PR or in this one still?

[arya2]

Left some comments, also, are the TODOs added supposed to be addressed in a later PR or in this one still?

They're all meant to be addressed in a later PR, the ones related to referencing the final versions of draft ZIPs are meant to be addressed when those draft ZIPs are finalized, the rest are addressed in #8694.