Texture: Set type and format at load time

[Popov72]

See https://forum.babylonjs.com/t/update-just-one-channel-of-texture/44163/4

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Snapshot stored with reference name:
refs/pull/14314/merge

Test environment:
https://babylonsnapshots.z22.web.core.windows.net/refs/pull/14314/merge/index.html

To test a playground add it to the URL, for example:

https://babylonsnapshots.z22.web.core.windows.net/refs/pull/14314/merge/index.html#WGZLGJ#4600

Links to test babylon tools with this snapshot:

https://playground.babylonjs.com/?snapshot=refs/pull/14314/merge
https://sandbox.babylonjs.com/?snapshot=refs/pull/14314/merge
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To test the snapshot in the playground with a playground ID add it after the snapshot query string:

https://playground.babylonjs.com/?snapshot=refs/pull/14314/merge#BCU1XR#0

[RaananW]

Just making sure - can this be a breaking change?

[Popov72]

It could be (but I don't think it will have a big impact), but it's really a bug.