Add support for "FETCH FIRST n ROWS ONLY" about sql-formatter HOT 3 CLOSED

Given than FETCH is equivalent to LIMIT, the last example looks fine to me. With LIMIT you'd get:

SELECT
  supplier_name,
  city
FROM
  suppliers 
LIMIT 
  2

An alternative would be to add full "FETCH FIRST" to reservedToplevelWords, so you'd get:

SELECT
  supplier_name,
  city
FROM
  suppliers 
FETCH FIRST
 2 ROWS ONLY

A separate question is whether we should improve the formatter to not break stuff like LIMIT 2 and FETCH FIRST 2 ROWS OWNLY to multiple lines.

PS After having written out this FETCH-FIRST-thing several times I'm not surprised most databases have opted for something shorter. It's surprisingly long thing to write to specify such a trivial thing.

from sql-formatter.

LIMIT
   2

and

FETCH FIRST
 2 ROWS ONLY

are correctly formatted according to our global formatting rules, but readability suffers.

I would prefer Joachim's example and even consider formatting LIMIT differently. E.g.

LIMIT 2

FETCH FIRST 2 ROWS ONLY

from sql-formatter.

For now added a fix to at least support the following formatting:

FETCH FIRST
    2 ROWS ONLY;

from sql-formatter.