Remove all errors when generating reference doc using api-extractor (#1095)

As is, generating reference doc for v2 sdk produces tons of errors. Most common errors are:

1) Exported type definition depending on unexported type definition 

2) Using `@hidden` tag which is unsupported in api-extractor

I solve both of these issues here.

I selected to use `@alpha` tag for params related types - that would prevent it from showing up in reference docs.

Author: taeold

docgen/api-extractor.v2.json

@@ -10,5 +10,25 @@
     "enabled": true,
     "reportTempFolder": "<projectFolder>/docgen/v2/temp",
     "reportFolder": "<projectFolder>/docgen/v2"
+  },
+  "messages": {
+    "compilerMessageReporting": {
+      "default": {
+        "logLevel": "warning"
+      }
+    },
+    "extractorMessageReporting": {
+      "default": {
+        "logLevel": "warning"
+      },
+      "ae-missing-release-tag": {
+        "logLevel": "none"
+      }
+    },
+    "tsdocMessageReporting": {
+      "default": {
+        "logLevel": "error"
+      }
+    }
   }
 }