feat: allow plain output support

[NickLarsenNZ]

Description

Resolves #142

• Rename old plain output option to table
• Ceate a new output option for plain which removes border characters and disables dynamic table arrangement.
  • There is an issue where there are multiple newlines between rows
  • There should be further discussion about what plain output should look like. This PR felt like a good-enough compromise between existing code and avoiding broken hyperlinks
  • We might need to use force_no_tty() when the output is plain, but I will look at that in a future PR where I add output options for cache list.

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
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# Author
- [ ] Changes are OpenShift compatible
- [ ] CRD changes approved
- [ ] Helm chart can be installed and deployed operator works
- [ ] Integration tests passed (for non trivial changes)

# Reviewer
- [ ] Code contains useful comments
- [ ] (Integration-)Test cases added
- [ ] Documentation added or updated
- [ ] Changelog updated
- [ ] Cargo.toml only contains references to git tags (not specific commits or branches)

# Acceptance
- [ ] Feature Tracker has been updated
- [ ] Proper release label has been added

Once the review is done, comment bors r+ (or bors merge) to merge. Further information

[Techassi]

Exact styling of the new plain output mode can be discussed later. For now, a table without borders and line-wraps seems sufficient.