Replace script_plugins with a clippy like rustc driver (named crown) (#30508)

* Remove script_plugins

* Use crown instead of script_plugins

* crown_is_not_used

* Use crown in command base

* bootstrap crown

* tidy happy

* disable sccache

* Bring crown in tree

* Install crown from tree

* fix windows ci

* fix warning

* fix mac

libscript_plugins.dylib is not available anymore

* Update components/script/lib.rs

Co-authored-by: Martin Robinson <mrobinson@igalia.com>

* Update for nightly-2023-03-18

Mostly just based off https://github.com/servo/servo/pull/30630

* Always install crown

it's slow only when there is new version

* Run crown test with `mach test-unit`

* Small fixups; better trace_in_no_trace tests

* Better doc

* crown in config.toml

* Fix tidy for real

* no sccache on rustc_wrapper

* document rustc overrides

* fixup of compiletest

* Make a few minor comment adjustments

* Fix a typo in python/servo/platform/base.py

Co-authored-by: Samson <16504129+sagudev@users.noreply.github.com>

* Proper test types

* Ignore tidy on crown/tests

---------

Co-authored-by: Martin Robinson <mrobinson@igalia.com>

components/script/fetch.rs

@@ -136,7 +136,7 @@ fn request_init_from_request(request: NetTraitsRequest) -> RequestBuilder {
 }
 
 // https://fetch.spec.whatwg.org/#fetch-method
-#[allow(unrooted_must_root, non_snake_case)]
+#[allow(crown::unrooted_must_root, non_snake_case)]
 pub fn Fetch(
     global: &GlobalScope,
     input: RequestInfo,
@@ -211,7 +211,7 @@ impl FetchResponseListener for FetchContext {
         // TODO
     }
 
-    #[allow(unrooted_must_root)]
+    #[allow(crown::unrooted_must_root)]
     fn process_response(&mut self, fetch_metadata: Result<FetchMetadata, NetworkError>) {
         let promise = self
             .fetch_promise