Replay events on event handling failures due to persistence failures.

[G8XSU]

Handle 3 types of failures mainly:

• Failed to update payment_store due to persistence failure.
• Failed to push ldk_node event to event_queue due to persistence failure.
• Output tracking failure in output_sweeper due to persistence failure.

[tnull]

Generally looks good as a first step, two comments though.

In a follow-up (probably based on/after #365 landed) we should try to tackle as many of the remaining explicit panics on persistence failure as possible.

[tnull]

Also needs a rebase to account for the yanked 0.0.124.

[G8XSU]

Rebased and addressed comments.

[tnull]

LGTM