I dug through the code and the WebCryptoAPI spec to figure out the
reason for `... mixed case parameters` WPT tests and figured out that
our implementation was slightly wrong.
By being closer to the spec we can now pass those tests and also remove
a bunch of duplicated code.
Context: https://github.com/LadybirdBrowser/ladybird/pull/2598#discussion_r1859263798
Resulting in a massive rename across almost everywhere! Alongside the
namespace change, we now have the following names:
* JS::NonnullGCPtr -> GC::Ref
* JS::GCPtr -> GC::Ptr
* JS::HeapFunction -> GC::Function
* JS::CellImpl -> GC::Cell
* JS::Handle -> GC::Root