rethink Status struct for with proper semantics all features

[alaypatel07]

Describe the feature you'd like to have.
Once an rsync client pod has started, it would be good to get the following:

• StartedTime
• Progress Percentage
• Last few lines of logs for at a glance debugging

As the rsync pod completes, it would be good to get:

• FinishedAt
• exit code
• last few lines of logs

If the rsync pod is not running, would be good to heuristic of why it is not running

What is the value to the end user? (why is it a priority?)
The user of the library will be able to expose this information in their ux workflow

How will we know we have a good solution? (acceptance criteria)
The struct makes good semantic meaning for all scenarios

Additional context
Some of the options proposed and discussed were here in the PRR https://github.com/backube/pvc-transfer/pull/14/files#r812114598