visitParamExtractRaw does not work if the JSON contains a string with unmatched { or [

### Query

`select visitParamExtractRaw('{"k":"{"}', 'k')`

### Expected result

`'"{"'`

### Actual result

`''`

### Clickhouse version

20.4.4.18-stable

### Additional information

Also applicable for `[` instead of `{`.