Add plugin types (#1527)

Covered following plugins
- addAttributesToSVGElement.js 
- addClassesToSVGElement.js 
- cleanupAttrs.js 
- convertEllipseToCircle.js 
- removeAttributesBySelector.js 
- removeAttrs.js 
- removeComments.js 
- removeDesc.js 
- removeDoctype.js 
- removeElementsByAttr.js 
- removeEmptyText.js 
- removeMetadata.js 
- removeRasterImages.js 
- removeScriptElement.js 
- removeStyleElement.js 
- removeTitle.js 
- removeXMLProcInst.js

plugins/removeDesc.js

@@ -17,6 +17,8 @@ const standardDescs = /^(Created with|Created using)/;
  * https://developer.mozilla.org/en-US/docs/Web/SVG/Element/desc
  *
  * @author Daniel Wabyick
+ *
+ * @type {import('../lib/types').Plugin<{ removeAny?: boolean }>}
  */
 exports.fn = (root, params) => {
   const { removeAny = true } = params;