Support asynchronous parsing

[mdoury]

zod exports the parseAsync and safeParseAsync methods to handle asynchronous refinements and transforms.

If you use asynchronous refinements or transforms (more on those later), you'll need to use .parseAsync

It'd be great it zodix could support those to improve the overall compatibility with zod.

[mdoury]

I'm not sure which way to go, I see two solutions to this problem:

1. make all parsing functions asynchronous by default
2. add asynchronous methods to the package, i.e. parseParamsAsync, parseParamsSafeAsync, parseQueryAsync, and parseQuerySafeAsync ?

In zod, parseAsync and safeParseAsync methods handle both synchronous and asynchronous cases.

In my opinion the first solution is better as it does not increase the number of methods in zodix, making it harder to use and to maintain.
Additionally, zx.parseForm and zx.parseFormSafe are already asynchronous so this would make the use of zodix parsing methods more homogenous.
However this would introduce breaking changes... It's probably better to introduce them now than later but it's still annoying.

@rileytomasek Do you know of any use cases where the user is not able to call an async function? The only one I can think of is during render, but zodix should probably not be used during render anyway.