Add development chain-spec file for minimal/parachain templates for Omni Node compatibility #15172

Job	Run time
preflight / preflight	43s
preflight / ci-versions	57s
check-runtime-migration (westend)	6m 21s
check-runtime-migration (asset-hub-westend)	5m 1s
check-runtime-migration (bridge-hub-westend)	4m 16s
check-runtime-migration (collectives-westend)	4m 32s
check-runtime-migration (coretime-westend)	4m 23s
All runtime migrations passed	1s
	26m 14s

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