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Add wasmtime-specific C APIs for tables (#1654)
This commit adds a suite of `wasmtime_funcref_table_*` APIs which mirror the standard APIs but have a few differences: * More errors are returned. For example error messages are communicated through `wasmtime_error_t` and out-of-bounds vs load of null can be differentiated in the `get` API. * APIs take `wasm_func_t` instead of `wasm_ref_t`. Given the recent decision to remove subtyping from the anyref proposal it's not clear how the C API for tables will be affected, so for now these APIs are all specialized to only funcref tables. * Growth now allows access to the previous size of the table, if desired, which mirrors the `table.grow` instruction. This was originally motivated by bytecodealliance/wasmtime-go#5 where the current APIs we have for working with tables don't quite work. We don't have a great way to take an anyref constructed from a `Func` and get the `Func` back out, so for now this sidesteps those concerns while we sort out the anyref story. It's intended that once the anyref story has settled and the official C API has updated we'll likely delete these wasmtime-specific APIs or implement them as trivial wrappers around the official ones.
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