Refactor DKG parameters into a `DkgParams` #514

Job	Run time
wasm-test (1.67, wasm32-unknown-unknown)	4m 20s
python-test (stable, wasm32-unknown-unknown, 3.12)	1m 20s
check	30s
yarn-test (stable, wasm32-unknown-unknown)	1m 39s
wasm-test (stable, wasm32-unknown-unknown)	2m 15s
test (x86_64-unknown-linux-gnu, 1.67)	5m 1s
test (x86_64-unknown-linux-gnu, stable)	2m 19s
codecov	4m 23s
compile-benchmarks	2m 48s
benchmark	0s
	24m 35s

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