Add the first version of whoisactive project (#943)

* add the first version of whoisactive

* address comments

* address comments

* fix the issues from the last commit

* clean up package.json

samples/sp_whoIsActive/src/constants.ts

@@ -0,0 +1,5 @@
+'use strict';
+
+// CONFIG VALUES ///////////////////////////////////////////////////////////
+export const extensionConfigSectionName = 'extensionSamples';
+export const configLogDebugInfo = 'logDebugInfo';