feat: add dynamic expire

[gurgunday]

This is to gather feedback, I really think an auto expire is missing from throttler: other rate limits like fastify-rate-limit automatically calculate the blockDuration by looking at the ttl of the key, which is what most people expect, see issue: nestjs/throttler#2208

As blockDuration must be passed to the increment method, this is the only way that comes to my mind to implement dynamic expiry without making a breaking change (by passing -1 or another negative value as blockDuration, which doesn't make sense anyway)

What do you think? Should we make this explicit in throttler, which might require a breaking change, or would this be acceptable in this lib if we document it properly?

[changeset-bot]

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