**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,
    WriteBuffer & buf,
    const Block & sample,
    ContextPtr context,
    WriteCallback callback,
    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);
    if (context->hasQueryContext() && context->getSettingsRef().log_queries)
        context->getQueryContext()->addQueryFactoriesInfo(Context::QueryLogFactories::Format, name);
    RowOutputFormatParams params;
    params.callback = std::move(callback);
    auto format_settings = _format_settings ? *_format_settings : getFormatSettings(context);
    /** TODO: Materialization is needed, because formats can use the functions `IDataType`,
      *  which only work with full columns.
      */
    auto format = output_getter(buf, sample, params, format_settings);
    
    if (format_settings.enable_streaming)
        format->setAutoFlush();
    
    if (auto * mysql = typeid_cast<MySQLOutputFormat *>(format.get()))
        mysql->setContext(context);
    addExistingProgressToOutputFormat(format, context);
    return format;
}
String FormatFactory::getContentType(