[multi-chain] Implement a generic chain spec #699

Job	Run time
Check EDR	2m 36s
Run Prettier	21s
Check that edr_napi typings file is up to date	4m 29s
Test EDR TS bindings (ubuntu-latest)	7m 35s
Test EDR TS bindings (macos-latest)	25m 45s
Check EDR Style	55s
Build EDR Docs	32s
Test EDR (ubuntu-latest)	6m 33s
Test EDR TS bindings (windows-latest)	10m 52s
Test EDR (macos-latest)	5m 10s
Test EDR (windows-latest)	10m 50s
	1h 15m 38s

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