Create an Int input

[aaroncox]

We're currently using generic JS numbers for a lot of state that could otherwise be cast to one of the Antelope Int types.

https://wharfkit.com/docs/antelope/int

We should create a new number input, similar to what we do on with Name types, that accepts any Int type and allows binding the value of the input and also performs validation.

We may need to figure out how to use generics with components in order to properly type the binding.