RFC: glib: Add optional support for serialization and deserialization with serde #3254

Job	Run time
build GTK binaries with gvsbuild	12s
build gtk-rs on Windows (cairo, true, --features png,pdf,svg,ps,use_glib,v1_16,freetype,script,wi...	3m 10s
build gtk-rs on Windows (gdk-pixbuf, true, --features v2_42)	2m 56s
build gtk-rs on Windows (gio, true, --features v2_74)	2m 43s
build gtk-rs on Windows (glib, true, --features v2_74)	3m 32s
build gtk-rs on Windows (glib, true, --features v2_74,serde)	3m 41s
build gtk-rs on Windows (glib-build-tools, false)	1m 7s
build gtk-rs on Windows (graphene, false)	2m 5s
build gtk-rs on Windows (pango, true, --features v1_50)	2m 14s
build gtk-rs on Windows (pangocairo, true)	2m 1s
build gtk-rs on Windows (examples, false, --bins --examples --all-features)	2m 24s
	26m 5s

Provide feedback