Allow configuring number of attempts to produce a value with `Filter()`

[swist]

I understand this is a pretty rare use-case, but it would be great to dial the tradeoff between taking a long time to Filter() a valid value and number of values we get. At the moment if we don't produce a value that passes Filter() within small attempts (currently set to 5), the generator fails. Would it make sense to make it an optional argument to Filter()?

[flyingmutant]

Can you provide some use cases from your experience where this would be valueable?

[swist]

We have written a generic schema based generator (take a protobuf schema, generate a protobuf out). The high level idea looks a bit like so:

generators.MakeProto(&SomeProtoObject{}).
    Filter(func (p *SomeProtoObject) {return p.Valid()})

(you can ignore the non generic syntax here, there's other reasons for it, namely we don't know the concrete protobuf message type at compile time)

in practice this works if I crank up the value of retries to something larger O(100) - O(1000) then it's actually viable and we've used that with decent success

You can think of it as a dial for Make[T]

I've raised #86 to suggest an API for it, happy to iterate on this if you think it's a good idea