Implement ACP-226 Math

[ceyonur]

Why this should be merged

Adds relevant excess calculation and math functions for acp-226

https://github.com/avalanche-foundation/ACPs/blob/main/ACPs/226-dynamic-minimum-block-times/README.md#minimumblockdelayexcess

This is a very similar package as in https://github.com/ava-labs/coreth/tree/master/plugin/evm/upgrade/acp176

How this works

Adds functions from https://github.com/ava-labs/coreth/tree/master/plugin/evm/upgrade/acp176 with acp-226 parameters defined in the spec.

How this was tested

added tests

Need to be documented in RELEASES.md?

probably not

[Copilot]

Pull Request Overview

This PR adds ACP-226 math package that implements dynamic minimum block delay calculations. The package provides functionality for calculating target delays based on excess values using exponential pricing mechanisms similar to those found in ACP-176.

Key changes:

• Implements core ACP-226 math functions for target delay excess calculations
• Adds comprehensive test coverage for all mathematical operations
• Provides serialization/deserialization utilities for state management

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
vms/evm/acp226/acp226.go	Core implementation of ACP-226 math functions including target delay calculations, excess updates, and state serialization
vms/evm/acp226/acp226_test.go	Comprehensive test suite covering all mathematical operations, edge cases, and benchmarks

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[ceyonur]

closes ava-labs/coreth#1230

[alarso16]

I assume we can come up with some way of combining the math with everything acp176 related, since most of the code is super similar, but it looks correct