Currently we have TextField variants with the following `value`, `onValueChange` parameters:

CoreTextField(EditorValue, (EditorValue) -> Unit) (in ui.text)
TextField(EditorValue, (EditorValue) -> Unit) (in ui.foundation)
TextField(TextFieldValue, (TextFieldValue) -> Unit) (in ui.foundation)
FilledTextField(TextFieldValue, (TextFieldValue) -> Unit) (in ui.material)
FilledTextField(String, (String) -> Unit) (in ui.material)

EditorValue is the most powerful API, where every aspect of the text field is controllable, but also more cumbersome to use.
TextFieldValue is middle-weight, with only string value and selection controllable, but still a bit cumbersome to use
String is the least powerful API, but also the most convenient and powerful enough to satisfy the overwhelming majority of use cases.

My suggestion is to refactor these overloads to have each one fit into one of two overloads:
1. EditorValue-based (cumbersome, powerful)
2. String-based (convenient, useful)

The string-based variants would have an `onSelectionChanged: (Selection) -> Unit` parameter, but would not allow for a selection to be *controlled* (hence the past tense on the parameter name).

It seems to me like the need to control or listen to the selection state are both somewhat rare, but the need to control it is even more so. On the other hand, the need to control the text value is virtually 100% of the time. As a result, adding the overhead of the selection controllability in the common case feels wrong, since the times you might want to do that, the more powerful EditorValue API might be something you need to reach for anyway.

As a result, my proposal is to have the following APIs:

in ui.text:
fun CoreTextField(value: EditorValue, onValueChange: (EditorValue) -> Unit) (unchanged)

in ui.foundation:
fun TextField(EditorValue, (EditorValue) -> Unit) (unchanged)
fun TextField(value: String, onValueChange: (String) -> Unit, onSelectionChanged: (Selection) -> Unit)

in ui.material:
fun FilledTextField(EditorValue, (EditorValue) -> Unit)
fun FilledTextField(value: String, onValueChange: (String) -> Unit, onSelectionChanged: (Selection) -> Unit)