feat: Support package.json as a configuration location. (#1178)

* feat: Support `packageProp` in `cosmiconfig`
 This PR adds support for the storing `cspell` configuration in a `package.json` file. 
 This feature enables developers to remove yet another boilerplate file from their apps.

Author: James Whitney

packages/cspell-lib/src/Settings/CSpellSettingsServer.ts

@@ -37,6 +37,7 @@ export const ENV_CSPELL_GLOB_ROOT = 'CSPELL_GLOB_ROOT';
  *   the `cspell.config.js`.
  */
 const searchPlaces = [
+    'package.json',
     // Original locations
     '.cspell.json',
     'cspell.json',