[1.0 -> main] Limit sync-fetch-span by max-reversible-blocks if needed

[heifner]

Example output:

warn  2024-08-16T12:56:55.440 net-7     net_plugin.cpp:2021           active_sync_fetch_sp ] sync-fetch-span 5000 restricted to 3270 by max-reversible-blocks 3600, fork_db_size 329
info  2024-08-16T12:56:55.440 net-7     net_plugin.cpp:2179           operator()           ] ["jungle4.cryptolions.io:9870 - 34355da" - 2 95.216.44.76:9870] requesting range 1480342 to 1483611, fhead 1480341, lib 1480012

Merges release/1.0 into main including #545

Resolves #528

[ericpassmore]

Note:start
group: STABILITY
category: INTERNALS
summary: Limit sync-fetch-span by max-reversible-blocks if needed.
Note:end