feat: add lisan-ai component

[andrey-canon]

Description

This adds the frontend-essentials LisanAI component. This is a migration pr of eduNEXT#7

Issue # 1308

How to test

1. Set the testing mfe, in my case discussions
2. Add the module.config.js file

module.exports = {
    /*
    Modules you want to use from local source code.  Adding a module here means that when this app
    runs its build, it'll resolve the source from peer directories of this app.
  
    moduleName: the name you use to import code from the module.
    dir: The relative path to the module's source code.
    dist: The sub-directory of the source code where it puts its build artifact.  Often "dist".
    */
    localModules: [
        { moduleName: '@edx/frontend-component-header/dist', dir: '../frontend-component-header', dist: 'src' },
        { moduleName: '@edx/frontend-component-header', dir: '../frontend-component-header', dist: 'src' },
    ],
};

3. Checkout this branch
4. Go to discussion and add a new post
5. Test the behavior

2025-10-08.17-34-00.mp4

[johanseto]

LGTM

Working in my proto teak env

Screencast.from.09-10-25.08.15.49.webm