Use TextArea in AutoComplete instead of TextInput

[carlgieringer]

Not going to merge, just keeping track of branches.

• Use TextAreaWithMessage in AutoComplete instead of TextField
• Move useAutoComplete onKeyDown after handling so that it can see isDefaultPrevented().
• Make maxLength and length optional to FormMessage
• Calculate FormMessage's length from value.
• Construct a missing id for a TextAreaWithMessage's FormMessage.

Since I added the built files to Git so that I could install from this branch, to see the 'real' changes, do:

git diff HEAD^..HEAD -- . ':(exclude)packages/autocomplete/es/' ':(exclude)packages/autocomplete/lib/' ':(exclude)packages/autocomplete/types/' ':(exclude)packages/form/es/' ':(exclude)packages/form/lib/' ':(exclude)packages/form/dist/' ':(exclude)packages/form/types/'

[carlgieringer]

Needed by jest.