More direct way to get maximum texture size

To get the maximum texture size that you can create, you have to create a `Viewer` and wait for it to be ready. It creates a `Context` for you, which initializes the values of the global constant container `ContextLimits`, which has the value you are looking for `maximumTextureSize`. It would be nice to not have to jump through a bunch of hoops if you are just trying to get at that max texture size for the computer you are on.

Start by reading how Viewer creates and waits for a Context, then trace where ContextLimits.maximumTextureSize is initialized. Confirm the intended direct access path and check the existing ContextLimits behavior. Done means callers can obtain the maximum texture size without creating a Viewer or waiting for it to be ready.

Written by the indexing model from the issue text.