🚀: Support LIFO (Last-In-First-Out) intent processing

[Nek-12]

Based on comparison with other state management libraries, it would be beneficial to support a LIFO queue strategy for intents. While FlowMVI currently supports concurrent and dropped intents, a strict LIFO processing strategy can be useful for things like rapid UI commands where only the latest command is relevant (and previous unhandled ones should be skipped rather than dropped).

Ideas:

• Perhaps an intent buffer mode or a new queue configuration option.
• See how other reactive streams handle LIFO caching/processing.