feat: check file perms on identity files

[sdbondi]

Description

• adds check for o+rw file permissions for node and tor identity files on unix family systems
• adds an error type for common identity module
• improves hint output on failure
• clean up duplicate tor help message in code
• adds "watch status" to rustyline history
• remove get LAN ip functionality, since it is not useful, remove get_if_addrs dependency

Motivation and Context

Checking for and rejecting open file permissions on identity files is good practice (a la ~/.ssh)

How Has This Been Tested?

Manually, setting incorrect permissions on node identity and tor identity
Shutting down tor and checking that the base node and wallet emit the correct message

[delta1]

Looks good, untested