pgsql: Indent C code in flex and bison files

Indent C code in flex and bison files

In the style of pgindent, done semi-manually.

Discussion: https://www.postgresql.org/message-id/flat/7d062ecc-7444-23ec-a159-acd8adf9b586%40enterprisedb.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/30ed71e423ee63b263730b86326da2a629a29f84

Modified Files
--------------
contrib/cube/cubeparse.y               |    8 +-
contrib/seg/segparse.y                 |   22 +-
src/backend/bootstrap/bootparse.y      |   19 +-
src/backend/parser/gram.y              | 2490 +++++++++++++++++++++-----------
src/backend/replication/repl_gram.y    |   28 +-
src/backend/replication/repl_scanner.l |    5 +-
src/backend/utils/adt/jsonpath_gram.y  |   41 +-
src/backend/utils/adt/jsonpath_scan.l  |    4 +-
src/backend/utils/misc/guc-file.l      |    8 +-
src/bin/pgbench/exprparse.y            |    4 +-
src/interfaces/ecpg/preproc/pgc.l      |   24 +-
src/pl/plpgsql/src/pl_gram.y           |  469 +++---
12 files changed, 1955 insertions(+), 1167 deletions(-)