feat(core/vm): implement EIP-7883 - ModExp Gas Cost Increase #31606 #32015

[gzliudan]

Proposed changes

implement EIP 7883:

• core/vm: implement EIP 7883 - ModExp Gas Cost Increase ethereum/go-ethereum#31606
• core/vm: implement updates to modexp gas cost changes in eip 7883 ethereum/go-ethereum#32015

Types of changes

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• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Changes that don't change source code or tests
• docs: Documentation only changes
• feat: A new feature
• fix: A bug fix
• perf: A code change that improves performance
• refactor: A code change that neither fixes a bug nor adds a feature
• revert: Revert something
• style: Changes that do not affect the meaning of the code
• test: Adding missing tests or correcting existing tests

Impacted Components

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• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

Put an ✅ in the boxes once you have confirmed below actions (or provide reasons on not doing so) that

• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Tested on a private network from the genesis block and monitored the chain operating correctly for multiple epochs.
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A

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[Copilot]

Pull request overview

Implements EIP-7883-related changes to the bigModExp precompile, wiring the updated behavior into fork-based precompile selection (including a new Osaka precompile set) and adding test vectors/benchmarks.

Changes:

• Added an Osaka fork precompile set and updated active precompile selection to account for rules.IsOsaka.
• Extended bigModExp with new feature flags and updated its gas calculation / input handling accordingly.
• Added JSON test vectors and new unit test/benchmark coverage for the EIP-7883 modexp variant.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
core/vm/testdata/precompiles/modexp_eip7883.json	Adds modexp EIP-7883 test vectors used by JSON-driven precompile tests/benchmarks.
core/vm/contracts_test.go	Registers a new modexp variant address for tests and adds JSON-based test + benchmark entrypoints for EIP-7883.
core/vm/contracts.go	Introduces Osaka precompile set selection and updates bigModExp behavior/configuration for EIP-7883.

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