Backup/Restore Managed Instance (#1428)

* Enabled backup to and restore from URL

* Created RPC, but when process tries to load Microsoft.Azure.Storage.Blob.dll, it crashes

* Added create shared access token

* Code refactor

* Minor changes

* Changed RPC path

* Moved createSas RPC to the newly created BlobService, fixed PR comments

* Added sas expiration date parameter to the RPC

* Added copyright headers

* Removed ConnectionInstance property from BlobService

* Removed unhelpful comment

* Removed unused using statements

* Changed copy/paste comments

* Disposable objects fix

* Small formatting fix

* Changed backup to/restore from url supported device types

* Added backup to url integration test

* Created restore integration test. Test are now getting azure blob params from env variables instead of file.

* Culture invariant epiration date param, fixed comment, and typo

* Updated headers

* PR comments fix

* Changed supported device type logic

* string localization fix

* String formatting fix

* build failure fix

* Typo

* Updated supported restore device types

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

@@ -1532,6 +1532,11 @@
     <value>No backupset selected to be restored</value>
     <comment></comment>
   </data>
+  <data name="UnsupportedDeviceType" xml:space="preserve">
+    <value>Unsupported device type {0} for engine edition {1}.</value>
+    <comment>.
+ Parameters: 0 - deviceType (String), 1 - engineEdition (String) </comment>
+  </data>
   <data name="ScriptTaskName" xml:space="preserve">
     <value>scripting</value>
     <comment></comment>
@@ -1577,6 +1582,18 @@
     <comment>.
  Parameters: 0 - sessionName (String) </comment>
   </data>
+  <data name="NotSupportedCloudCreateSas" xml:space="preserve">
+    <value>Create shared access signature is not supported for cloud instances.</value>
+    <comment></comment>
+  </data>
+  <data name="CreateSasForBlobContainerFailed" xml:space="preserve">
+    <value>Cannot generate SAS URI for blob container.</value>
+    <comment></comment>
+  </data>
+  <data name="WriteSASCredentialToSqlServerFailed" xml:space="preserve">
+    <value>Failed storing shared access signature token on the SQL Servers.</value>
+    <comment></comment>
+  </data>
   <data name="CategoryLocal" xml:space="preserve">
     <value>[Uncategorized (Local)]</value>
     <comment>job categories</comment>