Auto merge of #25070 - cagandhi:named-form-getter, r=jdm

Named form getter

This PR contains changes related to adding named getter in Servo for getting the list of all meaningful property names for a HTMLFormElement object, and getting the value of a specific property name. The following changes have been made:

* uncomment the [named getter](f63b404e0c/components/script/dom/webidls/HTMLFormElement.webidl (L30)) from HTMLFormElement.webidl
* add the missing `NamedGetter` and `SupportedPropertyNames` methods to [HTMLFormElement](f63b404e0c/components/script/dom/htmlformelement.rs (L113))
* implement `SupportedPropertyNames` according to [the specification](https://html.spec.whatwg.org/multipage/forms.html#the-form-element:supported-property-names):
  * create an enum to represent the `id`, `name`, and `past` states for the sourced names
  * create a vector of `(SourcedName, DomRoot<HTMLElement>)` by iterating over `self.controls` and checking the element type and calling methods like `HTMLElement::is_listed_element`
---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #16479 (GitHub issue number if applicable)

components/script/dom/bindings/trace.rs

@@ -145,13 +145,15 @@ use style::values::specified::Length;
 use tendril::fmt::UTF8;
 use tendril::stream::LossyDecoder;
 use tendril::{StrTendril, TendrilSink};
-use time::{Duration, Timespec};
+use time::{Duration, Timespec, Tm};
 use uuid::Uuid;
 use webgpu::{WebGPU, WebGPUAdapter, WebGPUDevice};
 use webrender_api::{DocumentId, ImageKey};
 use webvr_traits::{WebVRGamepadData, WebVRGamepadHand, WebVRGamepadState};
 use webxr_api::SwapChainId as WebXRSwapChainId;
 
+unsafe_no_jsmanaged_fields!(Tm);
+
 /// A trait to allow tracing (only) DOM objects.
 pub unsafe trait JSTraceable {
     /// Trace `self`.