**Use case**

This works:

```
SELECT * FROM hits_100m_obfuscated INTO OUTFILE 'hits.csv' FORMAT CSV
```

But I want this:

```
SELECT * FROM hits_100m_obfuscated INTO OUTFILE 'hits.csv'
```

**Describe the solution you'd like**

Every format can register file extension(s) in format factory.
If format is not specified explicitly, we can detect it automatically by file extension.
It should work for compressed files `hits.csv.gz` as well.

The following extensions should be supported at least:
csv, tsv, parquet, orc, native, json, ndjson, xml, md, avro

**Addition details**

Let's also support omitting the format argument for `file`, `url`, `s3`, `hdfs` table functions. 
const String & name,
    ContextPtr context,
    const std::optional<FormatSettings> & _format_settings) const
{
    const auto & output_getter = getCreators(name).output_creator;
    if (!output_getter)
        throw Exception(ErrorCodes::FORMAT_IS_NOT_SUITABLE_FOR_OUTPUT, "Format {} is not suitable for output (with processors)", name);
    auto format_settings = _format_settings ? *_format_settings : getFormatSettings(context);
    Block empty_block;
    RowOutputFormatParams empty_params;
    WriteBufferFromOwnString empty_buffer;
    auto format = output_getter(empty_buffer, empty_block, empty_params, format_settings);
    return format->getContentType();
}
SchemaReaderPtr FormatFactory::getSchemaReader(