feat: adds option to tail logs

[ChrisJBurns]

Description

Previous to this PR, there was no way of tailing the logs, you had to continually run thv logs $SERVER_NAME to get the logs. Now, with the addition of the -t flag to thv logs $SERVER_NAME we can tail the last 100 log lines. If we want to make the 100 configurable, we can, thought I'd set a sensible default for now.

Changes

• adds -t tail flag to the logs subcommand
• refactored the logs command so that the code itself is in a separate function. none of the code has been removed, just moved into a separate function for readability
• uses RunE so we can return errors from the subcommands up to the main

Ref: #202

[JAORMX]

should we make this an IntVarP and pass the 100 that's the default?

[ChrisJBurns]

Not sure if we can make 100 the default here as that would mean it always tails 100 lines. We need a flag that allows users to tail or just output. However, I can add another variable that is an IntVarP that defaults to 100 and instead outputs the last 100 lines OR it will only tail the last 100 lines.