Add supported realm and shard(s) to Server Status API.

[jsync-swirlds]

Story Form

As a Block Node Subscriber or Publisher
I want to have a mechanism to determine the shard/realm values supported by a block node
So that I can only connect to block nodes that support the shard and/or realm I need.

Technical Notes

Block Nodes must support a single realm and 1 or more shards (currently only one).
An Hiero consensus node publisher can only support one realm and shard at a time.
Most block stream consumers only process a single realm, and may only handle a single shard.

We wish to add shard and realm (both of which may be repeated lists) supported to the block node status API so that publishers and subscribers alike can check the supported values before sending or receiving block streams.