Support custom derives for generated types (#34356)

* script: Derive more Default implementations for dictionaries.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Support arbitrary derives on generated enums.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Support arbitrary derives for generated dictionaries.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Support arbitrary derives for generated unions.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Derive more impls for generated dicts and unions.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Implement FromStr for generated enums.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* Fix clippy.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* crown: Allow returning unrooted values from Default::default.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

components/script/dom/bindings/codegen/Bindings.conf

@@ -527,3 +527,49 @@ DOMInterfaces = {
 },
 
 }
+
+Dictionaries = {
+'GPUCanvasConfiguration': {
+    'derives': ['Clone']
+},
+
+'GPUExtent3DDict': {
+    'derives': ["MallocSizeOf"],
+},
+
+'GPUObjectDescriptorBase': {
+    'derives': ['MallocSizeOf']
+},
+
+'GPUTextureDescriptor': {
+    'derives': ["MallocSizeOf"],
+},
+
+'HeadersInit': {
+    'derives': ["Clone"],
+},
+}
+
+Enums = {
+'GPUFeatureName': {
+    'derives': ['Hash', 'Eq']
+}
+}
+
+Unions = {
+'ByteStringSequenceSequenceOrByteStringByteStringRecord': {
+    'derives': ['Clone']
+},
+
+'HTMLCanvasElementOrOffscreenCanvas': {
+    'derives': ['Clone', 'MallocSizeOf']
+},
+
+'RangeEnforcedUnsignedLongSequenceOrGPUExtent3DDict': {
+    'derives': ['MallocSizeOf']
+},
+
+'StringOrUnsignedLong': {
+    'derives': ['Clone'],
+},
+}