Refactor DKG parameters into a `DkgParams` #513

Job	Run time
wasm-test (1.67, wasm32-unknown-unknown)	4m 23s
check	27s
python-test (stable, wasm32-unknown-unknown, 3.12)	1m 10s
wasm-test (stable, wasm32-unknown-unknown)	2m 13s
yarn-test (stable, wasm32-unknown-unknown)	1m 58s
test (x86_64-unknown-linux-gnu, 1.67)	5m 0s
test (x86_64-unknown-linux-gnu, stable)	2m 20s
codecov	4m 26s
compile-benchmarks	2m 40s
benchmark	0s
	24m 37s

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