Discover and download incremental snapshots during bootstrap

[brooksprumo]

• Make rpc_bootstrap() aware of local incremental snapshots #20169
• [Incremental Snapshots] Add RPC fn to query a specific snapshot's info #20173
• Get highest incremental snapshot info over RPC #20357
• Download incremental snapshots in bootstrap #20225

Proposed Implementation

Firstly:

• If snapshot fetch is disabled (--no-snapshot-fetch), then use existing behavior (no changes)
• If incremental snapshots are not enabled (no --incremental-snapshots flag), then use existing behavior (no changes)
• If incremental snapshot fetch is disabled (--no-incremental-snapshot-fetch flag), then use existing behavior (no changes)

1. Get all incremental snapshot hashes from CRDS for trusted nodes
2. Get all incremental snapshot hashes from CRDS for all nodes
3. Retain only the hashes from (2) that match a value from (1) (and their associated rpc addrs/ids)
4. Retain only the hashes from (3) that have a full snapshot slot that is a multiple of our full snapshot interval
   - We want to avoid downloading full snapshots when possible
5. Retain only the hashes from (4) that have the highest full snapshot slot
6. Retain only the hashes from (5) that have the highest incremental snapshot slot
7. Download the full snapshot (if we don't already have it)
8. Download the incremental snapshot (if we don't already have it)

[brooksprumo]

DONE!

[github-actions]

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