Expose typings string union type with all the valid icons accepted by <calcite-icon>

[hcampos-professional]

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Description

In the Maps SDK we use icons extensively and we are looking into how we can have type safe icon names. For now we've created a script which generates typescript definitions from the currently-installed asset files, but it seems like it would be better if Calcite exposed typings directly.

Acceptance Criteria

• components.d.ts should expose a CalciteIconName string union with all the valid icon names.
• (optionally) CalciteIcon.icon should be typed as icon?: CalciteIconName instead of icon?: string. In some cases the icon can be a boolean, in which case it would be type as icon?: CalciteIcon | boolean.

Relevant Info

calcite-ui-icons already exposes some typings: https://github.com/Esri/calcite-ui-icons/blob/master/index.d.ts They are generated with https://github.com/Esri/calcite-ui-icons/blob/master/bin/path-data.js#L113-L123 For Calcite Components we'd need to convert to kebab case.

Which Component

### Example Use Case We're planning on using it in the Maps SDK for JavaScript to validate the names of all the default icons used in widgets. ### Priority impact p4 - not time sensitive ### Calcite package - [X] @esri/calcite-components - [X] @esri/calcite-components-angular - [X] @esri/calcite-components-react - [ ] @esri/calcite-design-tokens - [ ] @esri/eslint-plugin-calcite-components ### Esri team ArcGIS Maps SDK for JavaScript

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