Stripping of table values is now behind a config option

[sjanusz-r7]

In draft for a little bit as I figure out maybe some alternative approaches/make this nicer.

This PR allows us to configure the stripping of whitespaces in columns.

Previously, the string values would be stripped when being inserted into the row by default. This behaviour is now configurable, with being on by default to maintain already existing expectations.

This allows us to do the following in Framework (future PR):

> services --tree
127.0.0.1        8800   tcp    tcp            open
127.0.0.1        8800   tcp    '- http        open
127.0.0.1        8800   tcp       '- jenkins  open

Another approach could have been to potentially attach an indent metadata to each cell/value in a row, and let the table handle this automatically. After poking at it, it seems to be more difficult though and I'm unsure about the payoff.

Testing

• Passing CI
• Verifying this behaviour makes sense for this usecase above
• bundle exec rspec spec