Add setUint32, getInt32, setFloat32, getFloat32, setFloat64, getFloat64 functions

[Gozala]

It appears that only reason protons library needs to allocate and pass around DataView objects along with Uint8Arrays is to use following methods:

• setUint32
• getInt32
• setFloat32
• getFloat32
• setFloat64
• getFloat64

It seem like it would be a good idea to expose them as static functions from these library so they could be used without having to deal with that in cases like this ipfs/protons#14 (comment)

[achingbrain]

The point there was that a lot of GC pressure would be created by creating new DataView objects repeatedly just to call one method.

How do you see that working here without creating short-lived objects? Reimplementing these methods to set the values without using the convenience DataView class or similar?

[achingbrain]

Protons now uses Uint8ArrayList objects which have these methods defined so I don't think this is an issue any more. Please reopen if so.