feat: add support for property inspector

[GeekyEggo]

• Adds support for importing @elgato/streamdeck in the scope of a browser.
• Adds streamDeck.plugin namespace for bi-directional communication with the plugin:
  • onDidReceivePluginMessage to receive messages from the plugin.
  • sendToPlugin to send messages to the plugin.
• Adds streamDeck.settings namespace:
  • getGlobalSettings to retrieve the global settings.
  • getSettings to retrieve the action settings.
  • onDidReceiveGlobalSettings to receive the latest global settings.
  • onDidReceiveSettings to receive the latest action settings.
  • setGlobalSettings to save the global settings.
  • setSettings to save the action settings.
• Adds streamDeck.system namespace:
  • openUrl to launch the specified URL in the user's default browser.
• Update package.json to export a default export (for Node.js), and a browser export (for the property inspector).
• Fix Coordinates type could erroneously have a non-number row type.

NB. logging from the property inspector is omitted from this PR.