SetWasmTailCall

There is a configuration function in the wasmtime C API, in [config.h](https://docs.wasmtime.dev/c-api/config_8h_source.html): `void wasmtime_config_wasm_tail_call_set(bool)`. This enables the tail call proposal, allowing modules containing `return_call` and `return_call_indirect` instructions to be executed.

I note that for many of the other functions in that header file, a method on `*Config` is provided.

Is there a particular reason why this function was left out, or am I OK to add a method for this configuration function to the struct?