This PR implements the `TextDecoderStream`. Other than introducing the
necessary mod and webidl files corresponding to `TextDecoderStream`,
this PR also involves some changes in `TextDecoder` and
`TrasnformStream`:
- The common part that can be shared between `TextDecoder` and
`TextDecoderStream` are extracted into a separate type
`script::dom::textdecodercommon::TextDecoderCommon`. This type could
probably use a different name because there is an interface called
`TextDecoderCommon` in the spec
(https://encoding.spec.whatwg.org/#textdecodercommon) which just gets
included in `TextDecoder` and `TextDecoderStream`.
- The three algorithms in `TransformStream` (`cancel`, `flush`, and
`transform`) all have become `enum` that has a `Js` variant for a JS
function object and a `Native` variant for a rust trait object. Whether
the cancel algorithm needs this enum type is debatable as I did not find
any interface in the spec that explicitly sets the cancel algorithm.
Testing: Existing WPT tests `tests/wpt/tests/encoding/stream` should be
sufficient
Fixes: #37723
---------
Signed-off-by: minghuaw <michael.wu1107@gmail.com>
Signed-off-by: minghuaw <wuminghua7@huawei.com>
Signed-off-by: Minghua Wu <michael.wu1107@gmail.com>
