Experimental python interface for finitediff #1171

Job	Run time
tests-argmin	3m 2s
tests-argmin-observer-paramwriter	13s
tests-argmin-observer-slog	33s
tests-argmin-serde1-feature	1m 24s
cargo-deny (advisories)	32s
cargo-deny (bans licenses sources)	28s
clippy	1m 43s
docs-build	32s
rustfmt	23s
tests-argmin-checkpointing-file	25s
tests-argmin-math	4m 34s
tests-argmin-observer-spectator	24s
tests-argmin-testfunctions	22s
tests-finitediff	25s
wasm-build	20s
	15m 20s

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