ClickHouse database datasource plugin update to 2.4.0

# 2.4.0 (2021-11-29)

## Enhancement:
* Add support for Grafana 8.x unified alerts, fix Altinity/clickhouse-grafana#380
* Add TLS support for backend alerts part of plugin Altinity/clickhouse-grafana#356 (comment)
* Add $naturalTimeSeries macro, look details in https://github.com/Vertamedia/clickhouse-grafana/pull/89/files#diff-cd9133eda7b58ef9c9264190db4534a1be53216edbda9ac57256fbd800368c03R383-R412
* Update golang-plugin-sdk-go to latest version
* Properly format Value in Table format, look details Altinity/clickhouse-grafana#379
* Remove toDateTime64 casting for column when time column is already DateTime64 to improve performance. Change test to ensure the casting is removed from the query, fix Altinity/clickhouse-grafana#360
* implements `$timeFilter64ByColumn(column_name)` macro, fix Altinity/clickhouse-grafana#343

## Fixes:

* implements properly GET and POST support for alert queries, fix Altinity/clickhouse-grafana#353
* SQL syntax highlight now works always, fix Altinity/clickhouse-grafana#174, fix Altinity/clickhouse-grafana#381
* fix Altinity/clickhouse-grafana#376,
* fix negative behavior for $perSecondColumns Altinity/clickhouse-grafana#337
* fix Altinity/clickhouse-grafana#374, ignore `--` inside quotas as comment

repo.json

@@ -2559,6 +2559,17 @@
               "md5": "cfef9af53b1ca05fa89efe00c1a7e1a8"
             }
           }
+        },
+        {
+          "version": "2.4.0",
+          "commit": "ddf3c2183ed1dfe08ed101d928b5af162a264ea2",
+          "url": "https://github.com/Vertamedia/clickhouse-grafana",
+          "download": {
+            "any": {
+              "url": "https://github.com/Vertamedia/clickhouse-grafana/releases/download/v2.4.0/vertamedia-clickhouse-datasource-2.4.0.zip",
+              "md5": "29d8828545b34c214fbae32cbd609a72"
+            }
+          }
         }
       ]
     },
@@ -7308,4 +7319,4 @@
       ]
     }
   ]
-}
+}