refactor: encapsulate provider logic in transaction-controller, eliminate ethQuery

[matthewwalsh0]

Explanation

Currently, transaction-controller passes ethQuery instances throughout the codebase — into utils, helpers, hooks, and gas flows — to make RPC calls. This couples every layer to EthQuery internals and makes the provider plumbing verbose and fragile.

This PR introduces a utils/provider.ts module with two functions:

• rpcRequest(messenger, { chainId?, networkClientId? }, method, params?) — sends a JSON-RPC request given just a messenger and chain/network identifier
• getProvider(messenger, { chainId?, networkClientId? }) — returns the raw provider for cases that need it (e.g. layer 1 gas fee flows)

All ethQuery/EthQuery usage is replaced across utils, gas flows, helpers, hooks, and TransactionController itself. The @metamask/eth-query dependency is removed entirely.

Breaking changes

• GasFeeFlowRequest type: ethQuery field replaced with networkClientId
• determineTransactionType second parameter changed from ethQuery to an options object { messenger, networkClientId }
• @metamask/eth-query removed as a dependency

References

None

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