* Remove ForeignFunctionEnv wrapper around PluginEnv
This will enable PluginEnv to be the Store context when migrating to
Wasmtime.
* Pass PluginEnv by value to load_plugin_instance
This will allow removing the Clone impl from PluginEnv when migrating to
Wasmtime as required by the missing Clone impl on Wasmtime's WasiCtx.
* Avoid passing a Store around when an Engine is enough
* Pass PluginEnv to the wasi read/write functions
Wasmtime requires storing the read/write end of the pipe outside of the
WasiCtx. Passing PluginEnv to these functions allows storing them in the
PluginEnv.
* Migrate to Wasmtime
* Switch from wasi-common to wasmtime-wasi
* Reduce verbosity of wasmtime_wasi logs
* Increase startup delay
To wait for all plugins to be compiled.
* Disable some wasmtime features
* Update to Wasmtime 21.0.1
7d7848cddc