Add release note for IntelliJ 3.31.0

[Flanker32]

Add release note for IntelliJ 3.31.0

@wezhang @t-rufang @lcadzy Please help add the HDInsights part

[t-rufang]

@Flanker32 Please help add these items in release notes.

Added

• Support for IntelliJ 2019.3
• Support link an HDInsight HIB cluster for no ARM permission users(Supported by smiles-a-lot girl Yi Zhou @lcadzy)

Changed

• List only Synapse workspaces rather than mixed Arcadia and Synapse workspaces

Fixed

• [IntelliJ][ReportedByUser] Run into exception when link an Aris cluster #3831 Fix ClassCastException when link an SQL Server big data cluster
• [IntelliJ][2019.3 EAP][console]Show two 'scala>' when run Spark Local Console #3806 Fix showing two 'scala>' when run Spark local console issue
• [IntelliJ][ReportedByUser][EAP193.1]In the console, IDE internal error occurred when using shortcut keys. #3864, [IntelliJ][EAP][ReportedByUser] Shortcuts (Ctrl+V) failed to paste and get an IDE internal error occurred in IntelliJ 193.1 #3869 Fix scala plugin version breaking change
• [IntelliJ][ReportedByUser] Uncaught Exception java.lang.StackOverflowError #3823 Fix uncaught StackOverflowError when calling SparkBatchJobDebugExecutor.equals() issue

[t-rufang]

Thanks Hanxiao!