chore(pluginlab): upgrade wasmtime from v33 to v35 + fix compile errors

The add_to_linker function calls were failing type inference because the
compiler couldn't determine the generic parameter D that represents the
data access pattern.

- Add explicit type annotations for PluginApi::add_to_linker using
  HasSelf<PluginHost> to specify that the host state provides access
  to PluginHost
- Add explicit type annotations for HostApi::add_to_linker using
  HasSelf<WasiState> to specify that the host state provides access
  to the entire WasiState

This resolves the "type annotations needed" compilation errors by
satisfying the HasData trait bounds required by Wasmtime's component
model.

Fixes: E0283 type inference errors in engine.rs

Author: topheman