Add a Compose API for Glide.

[sjudd]

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This is relatively early stage at this point. The API is likely to change in breaking ways. Ideally the migrations are not large, but I'd expect a few iterations.

There's already a TODO to improve the Preloader API and make the GlideImage API less reliant on GlideBuilder.

Early feedback and usage from developers is very welcome. Please let me know what changes or other features you might like to see.