Add suggested actions flow layout

[compulim]

Fixes #2745.

Changelog Entry

Added

• Resolves #2745. Added new flow layout to suggested actions, by @compulim in PR #3641

Description

Added a new layout to suggested action: inline. And a new option to curb the height of the container and make it scrollable: suggestedActionsInlineMaxHeight.

Specific Changes

• Added new layout to SuggestedActions.js, and refactored
• Modified SuggestedAction.js to use non-flexbox for laying out images inside buttons
• Updated styleOptions:
  • Added new flow option to suggestedActionLayout
  • Added new suggestedActionsInlineMaxHeight

• I have added tests and executed them locally
• I have updated CHANGELOG.md
• I have updated documentation

Review Checklist

This section is for contributors to review your work.

• Accessibility reviewed (tab order, content readability, alt text, color contrast)
• Browser and platform compatibilities reviewed
• CSS styles reviewed (minimal rules, no z-index)
• Documents reviewed (docs, samples, live demo)
• Internationalization reviewed (strings, unit formatting)
• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)

[corinagum]

One question, + don't forget to rename to flow instead of inline. LGTM!

[eedwards36]

When will this be released? Also what is the exact usage?

e.g. suggestedActionLayout: 'inline',