feat: 🎸 Configuration so viewer tools can nix handles (#1304)

* feat: 🎸 Configuration so viewer tools can nix handles

Adds a key to cornerstone configuration that allows to toggle on/off
handle rendering

Closes: #1223

* Update extension docs

* Update doc

* docs: include hideHandles configuration in our configuration docs

* chore: default to hiding handles for annotations

* chore: switch to drawHandlesOnHover to mimic legacy viewer functionality

* Flip logic for drawHandlesOnHover; reverse of hideHandles

* Don't hide the handles of ellipse or rectangle roi

* invert check

Co-authored-by: Danny Brown <danny.ri.brown@gmail.com>

extensions/cornerstone/README.md

@@ -85,6 +85,20 @@ Tools can be configured through extension configuration using the tools key:
   ...
 ```
 
+## Annotate Tools Configuration
+
+*We currently support one property for annotation tools.*
+
+### Hide handles
+This extension configuration allows you to toggle on/off handle rendering for all annotate tools:
+
+```js
+  ...
+  cornerstoneExtensionConfig: {
+    hideHandles: true,
+  },
+  ...
+
 ## Resources
 
 ### Repositories