Extra Mode branch

[Abdur-rahmaanJ]

LibSQL would like to remain compatible as long as possible with sqlite. However, PRs such as #87 tend to break compatibility. The feature it offers is great though. This is why i suggest having an "extra" branch where releases containing incompatible changes are merged so that people get to enjoy a power version of sqlite.

[psarna]

I think that it's fine to diverge in a way that #87 does it -- sqlite_module has a version number, so the existing code remains compatible, and only upgrades when the authors want it. A second branch would be a good idea, but it also doubles the maintainership burden, so for now I'd rather stick to a single main branch, and keep it as compatible as possible, but not at all costs (e.g. #87 is definitely good enough to just go in).

@penberg opinions?