EPIC: Change Block Node to process repeated block items

[jsync-swirlds]

Modifications to BlockStream and API definitions

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1. Convert proto API to repeated BlockItem for publishBlockStream

Modifications to the BlockNode codebase

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1. Change all Helidon-related elements to support List<BlockItem>.
2. Update dependency version for protobufs to bring in new definitions.
3. Update the ring buffer and other "services" in block node to support List<BlockItem>.
4. Update all tests as needed
5. Update bash tools to support repeated BlockItem(s).

Modifications to the Simulator

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1. Update simulator to produce variable length repeated block items
2. Update tests in the simulator as needed
3. Update smoke tests to test variable length repeated block items.