[w3c/uievents] Define events for drag-and-drop operations (textInput etc) (Issue #367)

See https://github.com/w3c/uievents/pull/362#discussion_r1458219635

https://html.spec.whatwg.org/#drag-and-drop-processing-model defines the drag and drop model and some events, and refers to Pointer Events spec for some events.

When performing a drag and drop operation in an editing host (or dropping in an editing host), browsers fire `textInput`, `beforeinput`, mutation events, `input` -- which isn't currently defined as far as I can tell.

Interestingly, the event order in Chromium and WebKit is `textInput` and then `beforeinput`, which maybe should be the other way around for consistency with input from typing.

Demo: https://software.hixie.ch/utilities/js/live-dom-viewer/saved/11841

I think this should integrate somehow with this part of HTML:

> If the [current target element](https://html.spec.whatwg.org/#current-target-element) is a text control (e.g., [textarea](https://html.spec.whatwg.org/#the-textarea-element), or an [input](https://html.spec.whatwg.org/#the-input-element) element whose [type](https://html.spec.whatwg.org/#attr-input-type) attribute is in the [Text](https://html.spec.whatwg.org/#text-(type=text)-state-and-search-state-(type=search)) state) or an [editing host](https://html.spec.whatwg.org/#editing-host) or [editable](https://w3c.github.io/editing/docs/execCommand/#editable) element, and the [drag data store item list](https://html.spec.whatwg.org/#drag-data-store-item-list) has an item with [the drag data item type string](https://html.spec.whatwg.org/#the-drag-data-item-type-string) "[text/plain](https://www.rfc-editor.org/rfc/rfc2046#section-4.1.3)" and [the drag data item kind](https://html.spec.whatwg.org/#the-drag-data-item-kind) text
>
>    Insert the actual data of the first item in the [drag data store item list](https://html.spec.whatwg.org/#drag-data-store-item-list) to have [a drag data item type string](https://html.spec.whatwg.org/#the-drag-data-item-type-string) of "[text/plain](https://www.rfc-editor.org/rfc/rfc2046#section-4.1.3)" and [a drag data item kind](https://html.spec.whatwg.org/#the-drag-data-item-kind) that is text into the text control or [editing host](https://html.spec.whatwg.org/#editing-host) or [editable](https://w3c.github.io/editing/docs/execCommand/#editable) element in a manner consistent with platform-specific conventions (e.g. inserting it at the current mouse cursor position, or inserting it at the end of the field).

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