[proposal] Update the `devcontainer.json` schema to be able to represent a 'mergedConfiguration'#206

joshspicer wants to merge 12 commits intomaindevcontainers/spec:mainfrom

joshspicer/consolidate-merged-lifecycle-hook-schemadevcontainers/spec:joshspicer/consolidate-merged-lifecycle-hook-schemaCopy head branch name to clipboard