Implement okapi_version() check everywhere

[fundthmcalculus]

Implement the okapi version function as implemented here: #422

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[tmarkovski]

Let's schedule this for sometime after GA

[fundthmcalculus]

My plan is to have this for better debugging support. We can ensure customers are using the native binary version that we think they are using. Mostly this applies to mobile, where you can't pull the native binary metadata to determine version number.

I'd rather get this out with the 1.6 release so that we can start using it if necessary. It's a trivial change, separate from the discussion surrounding how to version the wrapper libraries (which can be done close-to or post GA).