feat: add --order-by and --order parameters to parse and search commands

[digizeph]

Summary

This PR adds sorting capability to the parse and search commands, allowing users to output results in a specified order (e.g., chronological or reverse chronological).

Closes #98

Changes

• Added --order-by option to specify the field to sort by
• Added --order option to specify sort direction (asc/desc, default: asc)
• When ordering is requested, output is buffered and sorted before display
• Updated CHANGELOG.md with unreleased changes

Available Order-By Fields

• timestamp - Order by timestamp (default)
• prefix - Order by network prefix
• peer_ip - Order by peer IP address
• peer_asn - Order by peer AS number
• as_path - Order by AS path (string comparison)
• next_hop - Order by next hop IP address

Examples

# Parse with chronological ordering (ascending)
monocle parse file.mrt --order-by timestamp --order asc

# Parse with reverse chronological ordering (descending)
monocle parse file.mrt --order-by timestamp --order desc

# Search with ordering
monocle search -t 2024-01-01 -d 1h -p 1.1.1.0/24 --order-by timestamp --order desc

# Order by peer ASN
monocle parse file.mrt --order-by peer_asn --order asc

Notes

• Field names use underscores (e.g., peer_ip, as_path) to match the output field names
• When --order-by is specified, all output is buffered before display (similar to table format behavior)
• Without --order-by, streaming output behavior is preserved for better performance with large datasets