docs: Convert more examples within the imagebufalgo chapter.

Convert C++ and Python examples from the "Image transformations
and data movement" section of the "imagebufalgo" chapter into
tests within the "docs-examples" testsuites (#3992).

Update 'oiiotool' tabs to use a simple 'tab' instead of 'code-tab'
to prevent synchronized tab selection, which is inconsistent with the
other tabs using the 'literalinclude' directive.

Note: image hashes comparison can not be used for testing 'rotate',
'resample', 'resize', 'fit', and 'warp', as it produces minor differences
linked on the testing environment.

Signed-off-by: Jeremy Retailleau <[email protected]>