Refactor DKG parameters into a `DkgParams` #510

Job	Run time
yarn-test (stable, wasm32-unknown-unknown)	1m 45s
check	25s
wasm-test (1.67, wasm32-unknown-unknown)	4m 20s
python-test (stable, wasm32-unknown-unknown, 3.12)	1m 12s
wasm-test (stable, wasm32-unknown-unknown)	2m 21s
test (x86_64-unknown-linux-gnu, 1.67)	4m 58s
test (x86_64-unknown-linux-gnu, stable)	2m 34s
codecov	4m 35s
compile-benchmarks	2m 49s
benchmark	0s
	24m 59s

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