Add batch check command and safety features to CLI

[tomjn]

Main goal here is to add features so that when using vagrant we don't need to trigger a sudo call if we don't have to. That means checks and batch operations. Likewise accounting for if the user walks away and we prompt them for a sudo password, then other programs change the hosts file while we're waiting for permission to make changes

This depends on goodhosts/hostsfile#57

Features added:

• Extended check command to support batch checking: check <IP> <host1> <host2>...
• Added --quiet flag for check command (only return exit codes)
• Added --any flag for check command (match ANY instead of ALL hosts)
• Added --backup global flag to create backup before modifying hosts
• Added --safe global flag to detect concurrent modifications
• Added flushHostsfile() helper that implements backup and safety checks

Command updates:

• add, remove, clean now use flushHostsfile() for safe writes
• Backward compatible: single-arg check behavior preserved

Dependencies:

• Updated go.mod to use local hostsfile library with improvements

Exit codes:

• 0: Success (host(s) found or operation completed)
• 1: Check failed (host not found)
• 2: Invalid arguments

[Mte90]

To me make sense, what do you think @luthermonson?

[luthermonson]

great feature, huge fan of this. can you fix the lint error and we'll get this merged

[tomjn]

@luthermonson this is blocked by goodhosts/hostsfile#57, once that's merged and released this PR can be updated to use that which will fix CI

[luthermonson]

https://github.com/goodhosts/hostsfile/releases/tag/v0.1.7 released

[tomjn]

@luthermonson CI is passing now!

[luthermonson]

nice ;)

[tomjn]

@luthermonson @Mte90 any opposition to me merging?