Simple comment parsing in zone lockdowns

When adding IP address ranges to zone lockdowns, they are entered in a tiny multi-line textbox one at a time. This becomes messy very quickly and requires keeping documentation elsewhere (i.e. in a spreadsheet).

A simple fix would be to allow comments in the text field. Most of us have programming experience and are comfortable with reading/including comments. For example, instead of:

The following would be possible: # New York headquarters IP range
123.456.789.0/24 # Chicago office - remove after 2023-05-31