[terra-form-input] Add onInput to communicate changes made using dictation

[benbcai]

Bug Report

Description

Entries or changes made in an input using dictation do not trigger the onChange callback. Instead, onInput is triggered. Similar to #2727 onInput should also be added to form-input.

We should also investigation if other form elements (textarea, select, etc) also need onInput added.

Additional Context / Screenshots

Expected Behavior

Possible Solution

Environment

• Component Name and Version:
• Browser Name and Version:
• Node/npm Version: [e.g. Node 8/npm 5]
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@ Mentions

[ryanthemanuel]

We should evaluate if we need to do this on the text area as well.

[benbcai]

There is a team that uses text area for a comment box and would like to use dictation. They currently disabled dictation for the comment box due to this issue.