Add wasm support (#2199)

* Working towards a PoC for wasm

* Move bson and sqlite to plugins

* proof of concept now working

* tests are green

* Add CI test for --no-default-features

* Fix some tests

* Fix clippy and windows build

* More fixes

* Fix the windows build

* Fix the windows test

crates/nu_plugin_to_bson/src/main.rs

@@ -0,0 +1,6 @@
+use nu_plugin::serve_plugin;
+use nu_plugin_to_bson::ToBSON;
+
+fn main() {
+    serve_plugin(&mut ToBSON::new())
+}