feat(design): add prefix/suffix directives to @daffodil/design

[xelaint]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/graycoreio/daffodil/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Fixes: #472
Part of: #416

What is the new behavior?

Add Prefix/Suffix directive to easily add and style icons used in components.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[damienwebdev]

This should be split into two PRs since it can be done backward compatibly.

[xelaint]

This should be split into two PRs since it can be done backward compatibly.

Do I need to split it if the commits are separated correctly?

[damienwebdev]

I think it's worthy of two PRs. Each of these are unique enough.

[damienwebdev]

This looks good to me, some minor comments here and there.