Fix parsing of underscores in pg_plan_advice occurrence numbers

The pg_plan_advice scanner recognizes underscores as digit separators
just like the core parser, but used strtoint() to convert occurrence
numbers which does not support underscores.  Consequently, advice such
as SEQ_SCAN(x#1_0) failed to parse.  Fix by using pg_strtoint32_safe()
like the core scanner, and also add regression test coverage.

This bug was independently found and reported by Lukas Fittl and Chao
Li.  Backpatch down to v19 where pg_plan_advice was introduced.

Author: Chao Li <[email protected]>
Co-authored-by: Daniel Gustafsson <[email protected]>
Reported-by: Lukas Fittl <[email protected]>
Reported-by: Chao Li <[email protected]>
Reviewed-by: Daniel Gustafsson <[email protected]>
Reviewed-by: Lukas Fittl <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Discussion: 
https://postgr.es/m/CAP53PkzKeD=t90OfeMsniYrcRe2THQbUx3g6wV17Y=ztiwm...@mail.gmail.com
Backpatch-through: 19

Branch
------
REL_19_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/dfde93581dcfab7509b6b28863c5270eb8d94754

Modified Files
--------------
contrib/pg_plan_advice/expected/syntax.out | 16 ++++++++++++++++
contrib/pg_plan_advice/pgpa_scanner.l      | 17 ++++++++++++-----
contrib/pg_plan_advice/sql/syntax.sql      |  6 ++++++
3 files changed, 34 insertions(+), 5 deletions(-)

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