feat(design): add textarea component

[lderrickable]

PR Checklist

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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:

Addresses part of #416

Does this PR introduce a breaking change?

[ ] Yes
[x] No

[griest024]

The design land examples should be changed to the design package examples pattern

[griest024]

Very little of this component is actually specific to a text area beyond the selector and perhaps some of the styles. Would this be better suited to a more generalized focus directive and a CSS class?

[griest024]

This is never used; it should be removed.

[xelaint]

@griest024 this component should not have been built without the form field's refactor. I think the input, select, and textarea components will heavily depend on the fixing up form field.