set intent types to string

[zkuzmic]

Overview
There are a couple issues having to do with the intent prop on various components:

1. The types (in index.d.ts and those defined via PropTypes) do not account for the fact that user-defined intents can be added via theming.
2. Implementation of the intent prop is inconsistent from one component to the next. See the table below.

Component	Supports user-defined intents?	Supported default intents
Alert	✅	All (none, info, success, warning, danger)
Button	❌	success, danger
CornerDialog	❌	success, danger
Dialog	❌	success, danger
IconButton	❌	success, danger
InlineAlert	✅	All (none, info, success, warning, danger)
MenuItem	❌ (icon color, but not text)	success, danger, info
StatusIndicator	❌	success, danger, info
TableRow	❌	none, success, danger, warning
Toast	✅	All (none, info, success, warning, danger)

In an ideal world, these components would be consistent and the types could be generated based on what user-defined intents there are, if any. Doing that seems worthwhile, but that's going to be a bigger initiative. I think this will solve the problem for now.

Resolves #1319

Screenshots (if applicable)

Documentation

• Updated Typescript types and/or component PropTypes
• Added / modified component docs
• Added / modified Storybook stories

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[mshwery]

RIP