Sending show plan graph to ADS on Result Set updated event (#1300)

* Sending showplan graph over json rpc in Result updated event
Translating showplan graph into simple objects to be sent over JSON RPC

* Revert "Sending showplan graph over json rpc in Result updated event"

This reverts commit 2d63a625fd200d057bf6093e233f05dea440347c.

* Added string for localization

* Sending showplan graph over json rpc in Result updated event
Translating showplan graph into simple objects to be sent over JSON RPC

* Refactoring class

* Removing test warning

* Removing unused imports
Adding copyright

* Removing unused prop

* removing formatted string out .strings file

* Formatting files
Adding Errors in show plan graph

* Adding a separate event for execution plan

* Now sending mulitple graphs when a batch has more than one query.

src/Microsoft.SqlTools.ServiceLayer/Localization/sr.resx

@@ -4590,6 +4590,17 @@
     <value>{0} TB</value>
     <comment>Size in TeraBytes format</comment>
   </data>
+  <data name="OperatorDisplayCost" xml:space="preserve">
+    <value>{0:0.#######} ({1}%)</value>
+    <comment> display string for the operator cost property - 0.###### - is the float number format specifier.
+ Parameters: 0 - cost (double), 1 - percentage (int) </comment>
+  </data>
+  <data name="ActualOfEstimated" xml:space="preserve">
+    <value>{0} of
+{1} ({2}%)</value>
+    <comment>.
+ Parameters: 0 - actual (string), 1 - estimated (string), 2 - percent (decimal) </comment>
+  </data>
   <data name="TableNotInitializedException" xml:space="preserve">
     <value>Initialization is not properly done for table with id &apos;{0}&apos;</value>
     <comment>.