This reverts commit d327d5e8.

This documents the current thinking on the custom editor api. The current api proposal is not actually implemented yet

For #82514

Css is now inlined so this is not requried

Update codicons

Use US English for sycnhronize

Move icons out of translated strings

Add chevron to Safari and Firefox dropdowns

Propose API for [onWill|onDid][Create|Delete|Rename]

For reading, introduce the readFileStream capability that reduces
the overhead of low level file reading by switching to an event based
model.

For writing, try to consume up to N chunks of data from the underlying
source and directly call writeFile if the source is consumed. This will avoid
the overhead of low level file reading for small to medium files.