Make `maxDataSizeAllowedToBeEncoded` configurable

[diehuxx]

Maybe add a config to Dwn#create.

[csuwildcat]

Is this just so it's easier to change as we settle on something?

[diehuxx]

No, more that I don't see why we (contributors to this repo) need to settle on a single value at all. I can imagine developers wanting to tweak it different ways depending on what underlying data store they use.

This isn't a hill I'm trying to die on, just something that crossed my mind.

[thehenrytsai]

The theory for maintaining the same constant across different store implementations was to provide developers with consistent expectations, potentially simplifying their code by reducing the number of conditions they need to consider. But this is still just a theory.