add support for hot blocks

[kdembler]

Full log from the crash here: storage-squid.log. After the initial crash, the processor is stuck and not processing further blocks. @zeeshanakram3 suggested that this may be related to Subsquid feature that indexes un-finalized blocks and possibly rolls back to apply other blocks. This could explain why the squid on my laptop (which had a lot of pauses when syncing) didn't experience this and keeps syncing fine

[kdembler]

For future reference, for the time being we disabled processing of hot blocks and that has indeed resolved the issue. Reasoning is that Orion doesn't handle hot blocks so doing that only in storage squid will not bring any real UX improvement.