[w3c/editing] Expose event.getTargetRanges() in oncompositionstart (and possibly oncompositionend as well) (Issue #511)

michael created an issue (w3c/editing#511)

Problem: On Android-Chrome there's no way to capture initial composition target range (event.getTargetRanges()) when using dictation. There may be other situations like this.


Only `compositionstart` and `compositionend` are fired, no `beforeinput`, which I would need to determine selection (event.getTargetRanges) right before the composition started.

Reproduce:
- On a Samsung-Android phone, set cursor inside a word
- activate dictation (word gets underlined  → this is the selection I'm after)
- stop dictation immediately (before making any voice inputs)

https://github.com/user-attachments/assets/7bbf1ad1-99d4-4906-afe8-edf400af6c96

Observations:
- as soon as dictation is enabled a `compositionstart` event is fired (now waiting for voice inputs)
- if there are no voice inputs and the dictation is cancelled by the user, still a `compositionend` event is fired. Assuming that at the beginning the cursor was inside the word "hello" `event.data` will have `"hello"`

Problem:
- at `compositionend` there's no way for me to set the selection to what should be replaced (the word that gets underlined initially)
- in my editor this means i have to assume a collapsed selection (the cursor before dictation was enabled), which will insert the word from which the composition started again at the current cursor position.

Solution ideas:
- Expose `event.getTargetRanges` in compositionstart event. Then i can capture the initial range that should be replaced (the word that has been underlined)
- Change implementation so `event.data` is `""` when nothing has been dictated
- Only fire `compositionstart` event when something actually has been dictated.

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