Allow for report interval customization through CLI

[dhvogel]

PR description

This PR fixes #9270, allowing for customizable ethstats report intervals, which are needed by other blockchains like Linea to keep pace with faster block times than Ethereum Mainnet (see #9269).

Fixed Issue(s)

Fixes #9270

Thanks for sending a pull request! Have you done the following?

• Checked out our contribution guidelines?
• Considered documentation and added the doc-change-required label to this PR if updates are required. (I think probably not, because the CLI contains documentation, but let me know if otherwise)
• Considered the changelog and included an update if required.
• For database changes (e.g. KeyValueSegmentIdentifier) considered compatibility and performed forwards and backwards compatibility tests

Locally, you can run these tests to catch failures early:

• spotless: ./gradlew spotlessApply
• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests
• hive tests: Engine or other RPCs modified?

[macfarla]

looks good, just a suggestion re type of CLI param - you'll see elsewhere in the codebase Boxed types are used rather than primitives for CLI options

[dhvogel]

Ok, I've made the change from primitive to boxed type.

[macfarla]

spotless check is failing

[dhvogel]

I ran ./gradlew :app:spotlessApply and added the changes. Sorry about that.

[macfarla]

@dhvogel spotless is still failing

[dhvogel]

./gradlew spotlessApply caught some more formatting errors in addition to ./gradlew :app:spotlessApply

./gradlew :ethereum:ethstats:spotlessJavaCheck now passing

[dhvogel]

running ./gradlew integrationTest has two failures, QbftContractAcceptanceTest > shouldMineOnMultipleNodesEvenWhenClusterContainsNonValidator() and BftMiningAcceptanceTest_Part3 > shouldStillMineWhenANonProposerNodeFailsAndHasSufficientValidators. I don't know much about these tests but they seem like timing errors that are unrelated to the change