Factor out conversion of awt::XBitmap to BitmapEx in vcl

As a step to unify and deduplicate this in several places.
Three functional changes added to the new vcl::GetBitmal function:

1. The mask is inverted from transparency to alpha, as done in
VCLUnoHelper::GetBitmap (toolkit/source/helper/vclunohelper.cxx)
since commit 81994cb2b8b32453a92bcb011830fcb884f22ff3 (Convert
internal vcl bitmap formats transparency->alpha (II), 2023-07-25).

2. When awt::XBitmap::getMaskDIB returns no mask, use
ReadDIBBitmapEx to also try to read the alpha inside the data
in awt::XBitmap::getDIB, as done in InsertSubMenuItems
(framework/source/fwe/helper/actiontriggerhelper.cxx).

3. As an optimization, query awt::XBitmap for graphic::XGraphic
before all the bit processing.

Change-Id: I686751664a5bd612bda1d446b200a9386b1991b4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/176185
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Jenkins

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