**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. 
#include <Parsers/ASTIdentifier_fwd.h>
#include <Parsers/ASTInsertQuery.h>
#include <Parsers/ASTSelectWithUnionQuery.h>
#include <Parsers/CommonParsers.h>
#include <Parsers/ExpressionElementParsers.h>
#include <Parsers/ExpressionListParsers.h>
#include <Parsers/ParserSelectWithUnionQuery.h>
#include <Parsers/ParserWatchQuery.h>
#include <Parsers/ParserInsertQuery.h>
#include <Parsers/ParserSetQuery.h>
#include <Parsers/InsertQuerySettingsPushDownVisitor.h>
#include <Common/typeid_cast.h>
#include "Parsers/IAST_fwd.h"
namespace DB
{
namespace ErrorCodes
{
    extern const int SYNTAX_ERROR;
}
bool ParserInsertQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)