GetSubscription(): use per-object memory context.

Constructing a Subcription object uses a number of small or temporary
allocations. Use a per-object memory context for easy cleanup.

Get rid of FreeSubscription() which did not free all the allocations
anyway. Also get rid of the PG_TRY()/PG_CATCH() logic in
ForeignServerConnectionString() which were used to avoid leaks during
GetSubscription().

Co-authored-by: Álvaro Herrera <[email protected]>
Suggested-by: Andres Freund <[email protected]>
Reviewed-by: Amit Kapila <[email protected]>
Discussion: 
https://postgr.es/m/xvdjrdqnpap3uq7owbaox3r7p5gf7sv62aaqf2ju3vb6yglatr%40kvvwhoudrlxq
Discussion: 
https://postgr.es/m/CAA4eK1K=WjZ1maBCmj=5zdo66awpork5zbxvkeds0xdccb6...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/f16f5d608ca6830f452a3b1e9f72afc6851cab38

Modified Files
--------------
src/backend/catalog/pg_subscription.c    | 24 +++++-------
src/backend/foreign/foreign.c            | 66 +++++++++-----------------------
src/backend/replication/logical/worker.c | 36 ++++++++---------
src/include/catalog/pg_subscription.h    |  3 +-
4 files changed, 48 insertions(+), 81 deletions(-)

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