Derive `Ord` and `PartialOrd` for `ClassName` #2902

Job	Run time
doc-lints	45s
license-guard	30s
clippy	1m 51s
godot-itest (macos)	1m 11s
run-examples	1m 19s
godot-itest (windows)	2m 39s
rustfmt	17s
godot-itest (linux-full)	2m 35s
unit-test	2m 27s
godot-itest (linux-features-experimental)	2m 10s
godot-itest (linux-4.1)	1m 8s
godot-itest (linux-4.2)	1m 18s
godot-itest (linux-memcheck)	2m 44s
ci-status	2s
	20m 56s

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