Add API of sorts for transition table handling in trigger.c

Preparatory patch for further additions in this area, particularly to
allow MERGE to have separate transition tables for each action.

Author: Pavan Deolasee <[email protected]>
Reviewed-by: Álvaro Herrera <[email protected]>
Discussion: 
https://postgr.es/m/caboikdnj+8hej5d8tu56mrpkjhvrrbb2_cdkwwpiyncjxgd...@mail.gmail.com
Discussion: https://postgr.es/m/[email protected]

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/3a46a45f6f009785b46188ed862afbccfb4cf56a

Modified Files
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src/backend/commands/trigger.c | 172 ++++++++++++++++++++++++++++-------------
1 file changed, 119 insertions(+), 53 deletions(-)

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