feat(chat): add support for client side tools

[shaejaz]

Summary
Adds client side tool support to React and JS.

React usage:

<Chat
  // ...
  tools={[
    type: 'tool-name',
    component: () => <div>Tool Rendered</div>
  ]}
/>

Javascript usage:

chat({
  // ...
  tools: [
    {
      type: 'tool-name',
      template: {
        component: (_, { html }) => html`<div>Tool rendered</div>`,
      },
    },
  ],
}),

[Haroenv]

looks great, thanks!