add postgres19 compatibility

[sibowu-aws]

issue: #171

Fix postgresql-hll for PostgreSQL 19 compatibility

• Change InitializeHllAggregateOids() to InitializeHllAggregateOids(void).
  PG19 compiles with -Werror=old-style-definition, which rejects empty
  parameter lists as K&R-style declarations.

• Add PG19 branch for FuncnameGetCandidates() which added a new
  int *fgc_flags output parameter. PG19 unconditionally dereferences
  this pointer (*fgc_flags = 0), so passing NULL causes a server crash.
  Pass &fgc_flags with a local int variable instead.

• Use AllocSetContextCreateInternal() directly for PG19. The
  AllocSetContextCreate macro wraps the call in StaticAssertExpr(),
  which in PG19 uses C23 static_assert inside a struct. GCC 12 does
  not support this construct, causing a compile error.

• Add expected/card_op_1.out and expected/hash_1.out alternative
  output files. PG19 changed error messages to split the old single
  HINT line into separate DETAIL and HINT lines for function/operator
  lookup failures.

All code changes are guarded with #if PG_VERSION_NUM >= 190000 and
do not affect PG18 or earlier.

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