Add new method to TransactionController to determine whether EIP-7702 is supported for specified chains

[jeffsmale90]

Explanation

The TransactionController exposes a method isAtomicBatchSupported that determines whether a specified address is upgraded via EIP-7702 for specified chains.

This method adds isEIP7702Supported to determine whether specified chainIds support EIP-7702. This information can be inferred from the result of isAtomicBatchSupported, but that method is unnecessarily broad for this purpose.

References

This is required for MetaMask/metamask-extension#40152.

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
Adds a new read-only helper method and types with isolated logic and extensive tests; no transaction signing/sending behavior changes.

Overview
Adds a new TransactionController.isEIP7702Supported API that reports whether specified chainIds support EIP-7702 (or returns all supported chains when chainIds is omitted), using the confirmations_eip_7702.supportedChains feature flag and performing case-insensitive chain ID matching.

Exports new request/response types (IsEIP7702SupportedRequest/IsEIP7702SupportedResult), adds comprehensive unit tests for supported/unsupported/mixed/empty inputs, and documents the addition in the package changelog.

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