Add missing `derive(Getters)` for `dkg::{round1, round2}` (#741) #1327

Job	Run time
build with default features	27s
build with MSRV (1.66.1)	1m 47s
build with no_std (ristretto255)	25s
Clippy	25s
build with no_std (ed25519)	19s
test on beta	2m 3s
build with no_std (p256)	20s
build with no_std (secp256k1)	23s
build with no_std (rerandomized)	19s
actionlint	6s
Check Rust doc	25s
Rustfmt	13s
Check if automatically generated code is up to date	22s
	7m 34s

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