file_fdw: Support multi-line HEADER option.

Commit bc2f348 introduced multi-line HEADER support for COPY. This commit
extends this capability to file_fdw, allowing multiple header lines to be
skipped.

Because CREATE/ALTER FOREIGN TABLE requires option values to be single-quoted,
this commit also updates defGetCopyHeaderOption() to accept integer values
specified as strings for HEADER option.

Author: Shinya Kato <[email protected]>
Reviewed-by: Fujii Masao <[email protected]>
Reviewed-by: songjinzhou <[email protected]>
Reviewed-by: Japin Li <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Discussion: 
https://postgr.es/m/caozeurt+iwc47vhpms+uj4wszvolpsz2f2_wopm8m7o+cza...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/26cb14aea12a0f0c2f9a49de3865721936b711a7

Modified Files
--------------
contrib/file_fdw/data/multiline_header.csv |  4 ++
contrib/file_fdw/expected/file_fdw.out     | 29 +++++++++++++-
contrib/file_fdw/sql/file_fdw.sql          | 13 +++++++
doc/src/sgml/file-fdw.sgml                 |  4 +-
src/backend/commands/copy.c                | 62 +++++++++++++++++-------------
src/test/regress/expected/copy.out         | 18 +++++++++
src/test/regress/expected/copy2.out        |  6 +++
src/test/regress/sql/copy.sql              | 15 ++++++++
src/test/regress/sql/copy2.sql             |  3 ++
9 files changed, 125 insertions(+), 29 deletions(-)

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