Add reject_limit option to file_fdw

Hi,

4ac2a9bec introduced reject_limit option to the COPY command, and I was
wondering if it might be beneficial to add the same option to file_fdw.

Although there may be fewer practical use cases compared to COPY, it
could still be useful in situations where the file being read via
file_fdw is subject to modifications and there is a need to tolerate a
limited number of errors.

What do you think?

I've attached a patch.
Based on the synopsis of the CREATE/ALTER FOREIGN TABLE commands, the
value for the foreign table's option must be single-quoted. I’m not
entirely sure if this is the correct approach, but in order to
accommodate this, the patch modifies the value of reject_limit option to
accept not only numeric values but also strings.

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Regards,

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Atsushi Torikoshi
NTT DATA Group Corporation