Introduce strict mode for Romeo

[stjepangolemac]

Description

At the moment due to unexpected events that relate to external services Romeo relies upon it's possible to crash in such a state that replaying crashes it.

Context

When we started working on Romeo we decided that we'll crash for every unexpected events, or in this case transaction status updates. That made it easier to uncover and fix bugs but it also ultimately crashes Romeo when it can just ignore such events.

If we introduce something like a "strict mode" and disable it most of the time we can increase reliability of Romeo. When debugging an issue a strict mode can help us crash in a more meaningful way with an useful message.

Expected Approach

1. Introduce strict mode as a configuration option
2. When enabled don't crash but just log unexpected occurences

Acceptance Criteria

• Romeo doesn't crash on unknown transaction updates

[stjepangolemac]

cc @friedger @AshtonStephens