feat: support Etherscan API keys

[matthewwalsh0]

Explanation

Support the use of API keys when polling for incoming transactions in the TransactionController.

Provided by the client via the optional incomingTransactions.etherscanApiKeysByChainId property, since API keys may be exclusive to specific chains, based on the Etherscan host / domain.

References

Changelog

@metamask/transaction-controller

• ADDED: Add optional incomingTransactions.etherscanApiKeysByChainId constructor property to support API keys in requests to Etherscan.

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 highlighted breaking changes using the "BREAKING" category above as appropriate
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

[matthewwalsh0]

@metamaskbot publish-preview

[github-actions]

Preview builds have been published. See these instructions for more information about preview builds.

Expand for full list of packages and versions.

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