Implement ability to opt out of MDXProvider components

[johno]

Related to #821

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[johno]

I believe this change will require a change to types for @mdx-js/react and @mdx-js/preact since the MDXProvider component can now accept useParentContext={false}.

[wooorm]

/cc @ChristianMurphy as this is about types too

[ChristianMurphy]

This is the type for the MDXProvider

mdx/packages/react/types/index.d.ts

Lines 19 to 27 in f59b174

	/**
	* Prop type that includes a component dictionary
	*/
	interface ComponentsProp {
	/**
	* Mapping of names for JSX components to React components
	*/
	components: ComponentDictionary
	}

the update would look like

 /** 
  * Prop type that includes a component dictionary 
  */ 
 interface ComponentsProp { 
   /** 
    * Mapping of names for JSX components to React components 
    */ 
   components: ComponentDictionary 

+  /**
+   * description of new property goes here
+   *
+   * @defaultValue true
+   */
+  useParentContext?: boolean
 } 

[ChristianMurphy]

LGTM ✔️
Thanks @johno! 🙇