Add log file support to logging.c

This adds the ability for users of logging.c to provide a file handle
for a log file, where log messages are also written in addition to
stderr.

Reviewed-by: Amit Kapila <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/flat/CAEqnbaUthOQARV1dscGvB_EsqC-YfxiM6rWkVDHc%2BG%2Bf4oSUHw%40mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/41237556f8c554f691968dbdce5fa6f4012e8036

Modified Files
--------------
src/common/logging.c         | 27 +++++++++++++++++++++++++++
src/include/common/logging.h |  2 ++
2 files changed, 29 insertions(+)

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