Expose helper functions scan_quoted_identifier and scan_identifier.

Previously, this logic was embedded within SplitIdentifierString,
SplitDirectoriesString, and SplitGUCList. Factoring it out saves
a bit of duplicated code, and also makes it available to extensions
that might want to do similar things without necessarily wanting to
do exactly the same thing.

Reviewed-by: Matheus Alcantara <[email protected]>
Reviewed-by: Lukas Fittl <[email protected]>
Discussion: 
http://postgr.es/m/ca+tgmob-0w8306mvrjx5urtqt1aaasu8pi4ylrz1xfwzu-u...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/e0e819cc08d3dc6fe843779c2bb3388135d20d14

Modified Files
--------------
src/backend/utils/adt/varlena.c | 189 +++++++++++++++++++++-------------------
src/include/utils/varlena.h     |   3 +
2 files changed, 102 insertions(+), 90 deletions(-)

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