ENT-1361 Enforce Unicode settings for SQL server (#311) (#321)

* Enforce Unicode settings for SQL server (#311)

* Enforce correct unicode setting in the JDBC Url for SQL server

* Avoid cast/null check

* Fixed wrong string literal and added test to check the literal matches what Hikari expects

* Optimise Imports

* Constant for config tag and minor test improvement.

* Constant and case insensitive check

* Import and Capitalisation

* Missed curly brace

node-api/src/main/kotlin/net/corda/nodeapi/internal/persistence/CordaPersistence.kt

@@ -65,6 +65,10 @@ class CordaPersistence(
         }
     }
 
+    object DataSourceConfigTag {
+        const val DATA_SOURCE_URL = "dataSource.url"
+    }
+
     /**
      * Creates an instance of [DatabaseTransaction], with the given transaction isolation level.
      */