Remove uneccesary Converters

Introduced an IdentityConverter, that just passes the values through.

Author: bytefish

JSqlServerBulkInsert/src/main/java/de/bytefish/jsqlserverbulkinsert/converters/BooleanConverter.java

@@ -0,0 +1,8 @@
+package de.bytefish.jsqlserverbulkinsert.converters;
+
+public class IdentityConverter<TPropertyType> extends BaseConverter<TPropertyType> {
+    @Override
+    public Object internalConvert(TPropertyType value) {
+        return value;
+    }
+}