Support more texture formats with the OpenGL ES 2 renderer

[ccawley2011]

• I confirm that I am the author of this code and release it to the SDL project under the Zlib license. This contribution does not contain code from other sources, including code generated by a Large Language Model ("AI").

Description

This includes some of the changes from PR #9910, and also adds support for the GL_EXT_texture_format_BGRA8888 where available instead of swapping red and blue in the shader.

[slouken]

This PR is failing CI, FYI.

[slouken]

Have you done any performance testing to verify that using the extension is faster than colorswapping in the shader? My impression was that they were equivalent in speed, and if so, there's no need to add complexity by checking for the extension.