data/binding: Switch to strconv in converters where possible

[Jacalz]

Is your feature request related to a problem? Please describe:

It was noted in a binding PR that the conventions were slow. I suggested that we move to using the strconv package where possible because it is much faster that using fmt for string conversions and parsing.

#1717 (comment)

Is it possible to construct a solution with the existing API?

Should be possible. Will need some tweaking to the code that generates the "semi-generic" (proper generics in Go would probably help) type bindings. It will probably not work for cases with custom formats, but should work for most other cases.

Describe the solution you'd like to see:

Move every possible converter to use strconv for better performance. Custom formatting can naturally use fmt.