feat: add builder for signet node to aid instantiation and genesis in… #235

Job	Run time
rust-library-base / Feature Checks	1m 12s
rust-library-base / Base Checks / doctest	1m 36s
rust-library-base / Base Checks / Clippy	1m 3s
rust-library-base / Base Checks / Docs	18s
rust-library-base / Base Checks / Test Suite	4m 20s
rust-library-base / Base Checks / Rustfmt	12s
	8m 41s

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