feat!: Allow downstream users to avoid the precomputations that are needed for the FixedBaseMSM algorithm in FK20 #193

Job	Run time
Build - x86_64-unknown-linux-gnu	1m 9s
Build - aarch64-unknown-linux-gnu	1m 6s
Build - aarch64-apple-darwin	1m 17s
Build - x86_64-apple-darwin	1m 9s
Build - x86_64-pc-windows-gnu	5m 54s
Test - x86_64-unknown-linux-gnu	30s
Test - aarch64-unknown-linux-gnu	1m 1s
Test - x86_64-apple-darwin	53s
Test - aarch64-apple-darwin	27s
Test - x86_64-pc-windows-gnu	1m 8s
Publish	0s
	14m 34s

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