tiup: add document of tispark support in tiup cluster (#3963) #4136
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cherry-pick #3963 to release-4.0
What is changed, added or deleted? (Required)
Add documentations of (experimental) support of TiSpark in TiUP Cluster. It should be merged after pingcap/tiup#531 is released.
Which TiDB version(s) do your changes apply to? (Required)