fix: make odata search case insensitive (#225)

* fix: make odata search case insensitive

* fix: update odata contains operator to be case insensitive

Author: vishnurk6247

wavefront/server/plugins/datasource/datasource/odata_parser.py

@@ -350,7 +350,7 @@ def build_comparison(self, field: str, operator: str, value: str) -> str:
         if operator == 'contains':
             parsed_value = self.parse_value(value)
             self.params[param_key] = f'%{parsed_value}%'
-            return f'{field} {sql_op} {self.dynamic_var_char}{param_key}'
+            return f'LOWER({field}) {sql_op} LOWER({self.dynamic_var_char}{param_key})'
 
         elif operator == 'in':
             # Parse array values