feature: add merge command palette #3924

Job	Run time
Prepare version string	5s
Build / Build Windows x64	3m 58s
Build / Build Linux	3m 12s
Build / Build Linux (arm64)	3m 22s
Build / Build macOS (Apple Silicon)	3m 43s
Build / Build macOS (Intel)	5m 3s
Build / Build Windows ARM64	4m 13s
Package / Package Windows (win-x64)	35s
Package / Package macOS (osx-x64)	17s
Package / Package Windows (win-arm64)	34s
Package / Package macOS (osx-arm64)	22s
Package / Package Linux (linux-arm64)	1m 2s
Package / Package Linux (linux-x64)	1m 8s
	27m 34s

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