Function getDocumentIconIdFromExtension

getDocumentIconIdFromExtension(ext): string
Returns the icon id given a file extension from https://lfxstatic.com/@laserfiche/lf-resource-library@4/resources/icons/document-icons.svg.
Parameters
- ext: undefined | string
  file extension
Returns string
icon id
Example
```
getDocumentIconIdFromExtension('html'); // 'edoc-code-20'
```
- Defined in packages/lf-js-utils/dist/utils/icon-utils.d.ts:20