Implement Command-Line Flags Parsing for Capture and Signatures (Deprecated)

[ShohamBit]

Background
Although capture and signatures configurations are slated for deprecation, we still need to support them for backward compatibility. Users should be able to configure these options via command-line flags. We will mark these as deprecated internally and show warnings if they are used.

Tasks

Capture Flags (Deprecated)

• --capture file-write.enabled=<true/false>: Enable or disable capture of written files.
• --capture file-write.filters=<filter> (repeatable): Set filters for captured file writes.
• --capture file-read.enabled=<true/false>: Enable or disable capture of read files.
• --capture file-read.filters=<filter> (repeatable): Set filters for captured file reads.
• --capture executable.enabled=<true/false>: Capture executed files.
• --capture kernel-modules.enabled=<true/false>: Capture loaded kernel modules.
• --capture bpf-programs.enabled=<true/false>: Capture loaded BPF programs.
• --capture memory-regions.enabled=<true/false>: Capture memory regions with changed protections.
• --capture network.enabled=<true/false>: Capture network traffic.
• --capture network.pcap=<mode>: Set pcap file splitting mode.
• --capture network.pcap-options=<options>: Set pcap options.
• --capture network.pcap-snaplen=<snaplen>: Set pcap snaplen.

Signatures Flags (Deprecated)

• --signatures search-paths=<path> (repeatable): Add paths to search for signatures.
• --signatures rego=<settings>: Configure Rego-based signature settings.

Acceptance Criteria

• All capture and signatures flags parse correctly and produce no errors under valid usage.
• Deprecation warnings are displayed whenever these flags are used, guiding users to updated configuration approaches.
• The parsed settings integrate with the rest of the configuration, though these features may be removed or replaced in the future.

Why This Matters
Maintaining support for deprecated fields ensures a smooth transition for users who rely on older configurations. By still allowing these settings, we reduce disruptions and give users time to adapt to newer, recommended configurations.

[yanivagman]

Part of #4453