elliptic-curve: deprecate `MulByGenerator` (#1822) #2476

Job	Run time
test (stable)	12s
no_std (1.85.0, wasm32-unknown-unknown)	15s
no_std (stable, wasm32-unknown-unknown)	13s
test (1.85.0)	16s
no_std (stable, thumbv7em-none-eabi)	22s
no_std (1.85.0, thumbv7em-none-eabi)	18s
minimal-versions	0s
	1m 36s

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