Change Qbft to use its own QbftBlockHeader type

[jframe]

Fixed Issue(s)

Adds a specific QBFT block header type, decoupling this type from the Ethereum block header so that QBFT can be used for other blocks without needing specific knowledge of the EVM or EL mainnet concepts, e.g. Could be used for a beacon block on an L2.

Changes

• Introduced a qbft heaader type replacing the Ethereum header type
• Created services/type interfaces in qbft core for operations that need to be performed on the block header
• Added adaptors to the main qbft module to allow the use of Besu classes and services as qbft core types for use in the qbft core module

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.
• 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

[usmansaleem]

LGTM, couple of nit-picks but can be ignored.

[usmansaleem]

LGTM

[usmansaleem]

LGTM