Use DB native JSON operations for Delete post (#18122)

* Use DB native JSON operations for Delete post

https://community-daily.mattermost.com/plugins/focalboard/workspace/zyoahc9uapdn3xdptac6jb69ic/285b80a3-257d-41f6-8cf4-ed80ca9d92e5/495cdb4d-c13a-4992-8eb9-80cfee2819a4?c=cb23f737-89c3-4e19-861e-2466c0a16205

```release-note
NONE
```

* move to adapters

```release-note
NONE
```

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

store/sqlstore/adapters.go

@@ -43,6 +43,18 @@ func (a jsonArray) Value() (driver.Value, error) {
 	return out.Bytes(), nil
 }
 
+type jsonStringVal string
+
+func (str jsonStringVal) Value() (driver.Value, error) {
+	return strconv.Quote(string(str)), nil
+}
+
+type jsonKeyPath string
+
+func (str jsonKeyPath) Value() (driver.Value, error) {
+	return "{" + string(str) + "}", nil
+}
+
 type TraceOnAdapter struct{}
 
 func (t *TraceOnAdapter) Printf(format string, v ...interface{}) {