fix: add bindings to manage heuristic dissectors

[dehydr8]

Summary

Adds APIs to programmatically enable/disable protocols and heuristic dissectors at runtime, similar to Wireshark's "Enabled Protocols" dialog (Ctrl+Shift+E).

closes #25

Motivation

Captures using heuristic dissectors (like mac_nr_udp for 5G NR over UDP) weren't being decoded because these dissectors are disabled by default.

Changes

• Added listProtocols() / setProtocolEnabled() / setProtocolEnabledByName()
• Added listHeuristicDissectors() / setHeuristicEnabled()
• Each heuristic includes protocol_id to build hierarchical UI matching Wireshark

Usage

wg.set_heuristic_enabled("mac_nr_udp", true);
wg.load("nr.pcapng", data);

For building an "Enabled Protocols" dialog

// Get all protocols and heuristics
const protocols = wg.list_protocols();
const heuristics = wg.list_heuristic_dissectors();

// Group heuristics under their parent protocols (using protocol_id)
const protocolsWithHeuristics = protocols.map(proto => ({
  ...proto,
  heuristics: heuristics.filter(h => h.protocol_id === proto.id)
}));