Feature request: add easy and unified way to persist filters

[let4be]

Would be extremely useful for real-world usage

[alexk307]

Has there been any progress on this? It looks like the scalable filters have a WriteTo method to write to an io.Writer. Is this something that can be implemented in other filters?

I was thinking of using the same pattern and maybe using a RWMutex to allow for reading of the data while writing to the io.Writer concurrently.

If this is something desired, I can start immediately as my use case depends on this.

[tylertreat]

I accept PRs :)

[alexk307]

@tylertreat Great, I'll start working on it shortly.