Fast sync - deprecation warning

[macfarla]

PR description

Deprecation messages for FAST sync mode per https://www.lfdecentralizedtrust.org/blog/sunsetting-tessera-and-simplifying-hyperledger-besu

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:

• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests

[fab-10]

Other than fast sync, there are deprecation warnings for miner options and methods, should they go to another PR?

I see that this is built on top of #7905, fine to approve after that is merged

[macfarla]

Other than fast sync, there are deprecation warnings for miner options and methods, should they go to another PR?

I see that this is built on top of #7905, fine to approve after that is merged

Thanks @fab-10 all up to date now just needs approval (did not mean to build this PR on top of #7905 - sorry for the confusion!)