Expose mutable DNSQuery connection settings

[Copilot]

DNSQuery settings such as UDP mode were constructor-only, preventing runtime inspection or reconfiguration.

• Accessors: Added typed getters and setters for server, port, timeout, UDP mode, debug, and binary debug settings.
• Coverage: Added focused tests validating default values and runtime updates.

$query = new DNSQuery('dns.example.com');
$query->setUdp(false);

$isTcp = !$query->getUdp();

• Fixes Allow changes to Query object settings such as UDP mode #24

[purplepixie]

Simple getters and setters and tests. Checked functionality and no dangerous changes made by AI. Approved for merge.