Expose raw wasm-to-component call

[jsoverson]

Is your feature request related to a problem? Please describe.
Right now, wasm calls to other components use the same codegen config as the base operations. This can cause issues if inner calls need raw access while the parent operation is simple enough to use the generated decoding logic.

Propose a solution
Along with component.op_name() calls, expose a component.op_name_raw() (or similiar) that exposes the raw stream to the caller so they can do what they want.

Describe alternatives you've considered
Better, more flexible codegen configuration but - even still - a raw passthrough would always be useful.

[jsoverson]

Added via #371