Improve IP/network configuration UI

**Is your feature request related to a problem? Please describe.**
Adding a large number of IPs or networks to `Blocked IPs`, `Scan target list`, or `Network segmentation testing` in the configuration UI is cumbersome, as each IP or network must be put into its own field.

**Describe the solution you'd like**
Replace the `Blocked IPs`, `Scan target list`, and `Network segmentation testing` configuration fields with text blob fields. This would allow a user to simply copy-paste a list of IPs/Networks into the text field, rather than clicking the `+` button and adding a new field for each.

**Describe alternatives you've considered**
Users can solve this problem today by exporting the configuration, making modifications, and then importing the modified configuration file.