feat: builder code

[jeuryink]

No description provided.

[Copilot]

Pull request overview

This PR adds builder fee functionality to the protocol, enabling fee sharing with designated builders for order routing.

Changes:

• Implements builder-related fields in order appendix encoding (builder_id and builder_fee_rate)
• Adds ClaimBuilderFee slow mode transaction type and encoding
• Integrates OffchainExchange contract for querying builder information

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/utils/test_slow_mode.py	Tests for ClaimBuilderFee transaction encoding
tests/utils/test_order_appendix.py	Tests for builder field encoding/decoding in order appendix
sanity/builder.py	Integration tests for builder fee functionality
pyproject.toml	Adds builder-sanity command entry point
nado_protocol/utils/slow_mode.py	Implements ClaimBuilderFee transaction encoding
nado_protocol/utils/order.py	Adds builder field support to appendix bit layout
nado_protocol/utils/init.py	Exports new builder and slow mode utilities
nado_protocol/indexer_client/types/models.py	Adds builder_fee fields to indexer models
nado_protocol/contracts/types.py	Defines ClaimBuilderFeeParams and BuilderInfo types
nado_protocol/contracts/deployments/*.json	Adds offchain_exchange contract addresses
nado_protocol/contracts/abis/IOffchainExchange.json	Contract ABI for querying builder info
nado_protocol/contracts/init.py	Implements claim_builder_fee and get_builder_info methods
nado_protocol/client/init.py	Passes offchain_exchange address to contracts context

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