add const_image_span #126

Job	Run time
ios	1m 17s
android	4m 12s
conan - linux - x86_64	1m 23s
coverage - measure	1m 52s
macosx	2m 54s
msvs	3m 47s
linux - debian:bookworm	1m 35s
msys2 - mingw32	2m 8s
linux - arm32v7/debian:bookworm	8m 9s
msys2 - mingw64	2m 10s
linux - arm64v8/debian:bookworm	2m 31s
sanitizer - debian:bookworm	1m 38s
linux - ubuntu:jammy	1m 42s
sanitizer - arm32v7/debian:bookworm	7m 46s
linux - ubuntu:noble	1m 32s
linux - igagis/raspbian:bookworm	6m 40s
	51m 16s

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