feat(Table): Guideline updates

What does this MR do?

This MR adds updated guidelines to the Table component:

• Appearance: adds vertical alignment guidelines
• Behavior: added "new row" state
• Content: added new "caption" element
• Pagination: adds new guidelines for the compressed table option
• Structure: adds new illustration
• Variants: adds "Striped" and "Compressed" options

Closes: #860 (closed)

Does this MR meet the acceptance criteria?

• The MR title and commit message meet the Pajamas commit conventions
• Add a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
• Include MR scope that reflects the purpose of the change in the description
  • For example, if this MR is focused on usage guidelines, addressing accessibility challenges could be added separately with a different MR
• If creating a new page on Pajamas from scratch, follow the page template structure
• Follow the Pajamas Voice & Tone Guidelines and GitLab Documentation Style Guide
• Link components to and from other related components and patterns on the .md file, where helpful
• If embedding a Figma file, follow the Figma embed guide
• Assign it to a reviewer. All GitLab designers are reviewers, but you can also assign it directly to a maintainer or trainee maintainer
• Apply the correct component label(s)
• Select a milestone or due date

Links

See Figma comment: https://www.figma.com/file/Wli6qiEaC8rnXfeQiukJHw?node-id=425:11#143763382