Ryanunderhill/ortapibase enforce (#15940)
### Description
To prevent people from accidentally changing OrtApiBase, these
static_asserts will fire if anyone adds a method, rearranges the method
ordering, or changes the signature of any of the methods.
### Motivation and Context
People have submitted changes that have done these things and there was
no mechanism to stop them besides someone noticing in a code review. An
automated way to let people know is needed.
