[orc-rt] Introduce WrapperFunction APIs. (#157091)
Introduces the following key APIs:
`orc_rt_WrapperFunction` defines the signature of an ORC asynchronous
wrapper function:
```
typedef void (*orc_rt_WrapperFunctionReturn)(
orc_rt_SessionRef Session, void *CallCtx,
orc_rt_WrapperFunctionBuffer ResultBytes);
typedef void (*orc_rt_WrapperFunction)(orc_rt_SessionRef Session, void *CallCtx,
orc_rt_WrapperFunctionReturn Return,
orc_rt_WrapperFunctionBuffer ArgBytes);
```
A wrapper function takes a reference to the session object, a context
pointer for the call being made, and a pointer to an
orc_rt_WrapperFunctionReturn function that can be used to send the
result bytes.
The `orc_rt::WrapperFunction` utility simplifies the writing of wrapper
functions whose arguments and return values are serialized/deserialized
using an abstract serialization utility.
The `orc_rt::SPSWrapperFunction` utility provides a specialized version
of `orc_rt::WrapperFunction` that uses SPS serialization.
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