--test: support METHOD URL (default GET)

[blink-so]

Follow-up to #30: extend --test to support METHOD URL in addition to URL (defaults to GET).

Changes:

• Parse --test as one or two values ([METHOD] URL)
• Accept two-arg form or a single quoted string (e.g., "POST https://example.com")
• Method parsing is case-insensitive; falls back to GET on invalid
• Output now includes the method: ALLOW <METHOD> <URL> or DENY <METHOD> <URL>
• Tests added for both forms and case-insensitivity

Examples:

httpjail --js "r.host === 'google.com'" --test https://google.com
httpjail --js "r.method === 'POST' && r.host === 'example.com'" --test POST https://example.com
httpjail --js "r.method === 'PUT' && r.host === 'example.com'" --test "PUT https://example.com"