Fix DateTime timezone support: namespace::autoclean stub + keyword autoquoting

[fglock]

Summary

This PR completes Phase 11 of the CPAN client support, enabling full DateTime functionality including timezone support.

Changes

1. namespace::autoclean stub (src/main/perl/lib/namespace/autoclean.pm)

   • Provides the interface but skips cleanup entirely
   • Allows imported functions (like Try::Tiny's try/catch) to remain available
   • Fixes the "Undefined subroutine &DateTime::TimeZone::catch" error

2. Parser fix for keyword autoquoting (ListParser.java)

   • Extended AUTOQUOTABLE_KEYWORDS set to include: if, unless, while, until, for, foreach (in addition to existing and, or, xor, when)
   • Keywords followed by => are now correctly treated as bareword hash keys
   • Fixes parser errors like "Expected token } but got until"

DateTime Now Works with Timezones

./jperl -MDateTime -e '
  my $dt = DateTime->new(
      year => 2024,
      month => 3,
      day => 15,
      hour => 14,
      minute => 30,
      time_zone => "America/New_York"
  );
  print $dt->datetime, "\n";   # 2024-03-15T14:30:00
  $dt->add(days => 5, hours => 2);
  print $dt->datetime, "\n";   # 2024-03-20T16:30:00
'

Test Plan

• Unit tests pass (make)
• DateTime basic operations work
• DateTime with timezone works
• Keywords as hash keys work (e.g., { foo => 1, until => 2 })

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