feat: Adding alternateGasFees capability to wallet getCapabilities

[jpuri]

Description

Add capability for dapp to know if MM supports paying using other tokens also on a chain.

Related issues

Fixes: https://github.com/MetaMask/MetaMask-planning/issues/5234

Manual testing steps

1. Go to. test dapp
2. Click Get Capabilities button
3. Check result

Screenshots/Recordings

Pre-merge author checklist

• I’ve followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[Copilot]

Pull Request Overview

This PR adds support for alternateGasFees in the wallet's getCapabilities functionality so that dapps can determine if MetaMask supports paying with alternative tokens on a chain.

• Introduces a new relay utility (transaction-relay.ts) to assess relay support for chains.
• Updates the EIP-5792 capabilities logic to merge atomic and alternateGasFees capabilities based on relay and smart transaction checks.
• Adds comprehensive tests to verify the behavior of relay support and alternateGasFees in both the relay and capabilities modules.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
app/core/RPCMethods/transaction-relay.ts	New relay support utility, including network fetch and URL building.
app/core/RPCMethods/transaction-relay.test.ts	Tests to verify the relay support logic.
app/core/RPCMethods/eip5792.ts	Updates to include alternateGasFees capability integrated into getCapabilities.
app/core/RPCMethods/eip5792.test.ts	Test enhancements for alternateGasFees and atomic capability scenarios.

Comments suppressed due to low confidence (1)

app/core/RPCMethods/eip5792.ts:345

• [nitpick] For consistency, consider renaming 'chainIdNormalised' to 'chainIdNormalized' in the reduce callback.

    (acc, chainIdNormalised) => {

[github-actions]

Bitrise

✅✅✅ pr_smoke_e2e_pipeline passed on Bitrise! ✅✅✅

Commit hash: 39568d1
Build link: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/9353390b-a35e-48ca-ba5b-01b872ab888b

Note

• You can kick off another pr_smoke_e2e_pipeline on Bitrise by removing and re-applying the Run Smoke E2E label on the pull request

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
93.3% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Bitrise

✅✅✅ pr_smoke_e2e_pipeline passed on Bitrise! ✅✅✅

Commit hash: 16d96c9
Build link: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/0aa5904d-d825-4212-beb8-0663c3b2e357

Note

• You can kick off another pr_smoke_e2e_pipeline on Bitrise by removing and re-applying the Run Smoke E2E label on the pull request