feat: UIKit improvement and action processing

[Spiral-Memory]

Brief Title

This PR aims to enhance UiKit support in EmbeddedChat and enable action processing on the RC server.

Acceptance Criteria Fulfillment

• [x] Changed UiKit folder structure to modularize it.
• [x] Added state updation, view updation logic, parsing logic similar to Rocket.Chat code
• [x] Added contexts and action handlers to manage modals and facilitate action processing.
• [x] Implemented emitInteractions for sending values to the RC server.
• [x] Added global states to control modals and the contextual bar.
• [x] Resolved menu issues.
• [x] Introduced contextual bar support.
• [x] Fixed stylings.
• [x] Added support for static select and multi-select elements with custom components.
• [x] Created stories for these new components.
• [x] Addressed minor bugs.

Fixes #592

Video/Screenshots

Tested it on 3 RC apps and including the videos for each:

1. Reminder RC App

https://github.com/RocketChat/EmbeddedChat/assets/78961432/eeb17fd6-68f2-4113-8ef1-dc0faf32ca05

2. Notion RC App

https://github.com/RocketChat/EmbeddedChat/assets/78961432/71d9baa1-a54d-4077-9fbd-f7e005742f77

3. News Aggregation App (To test multi select)

https://github.com/RocketChat/EmbeddedChat/assets/78961432/d3f611b0-3205-483f-b00a-9800893b98fb

Note: It is necessary to rebuild the project with yarn and yarn build on root directory to start making use of UiKit support in EmbeddedChat

[Spiral-Memory]

Hey @sidmohanty11

The PR is now ready for review. I have restructured the existing uiKit related folders in the Embedded Chat and added all the necessary components that were missing or broken. I have done my best to align the changes with the Rocket.Chat codebase to ensure the UIKit can handle all cases as it does in Rocket.Chat.

The updates include UIKit messages, UI Modal, and UI Contextual Bar, all of which can now process actions and modify according to needs, whether it involves opening a new modal or updating an existing one. I have also added custom static and multi-select elements to match the look and feel of our themes. There are many other modifications detailed in the PR description.

I have tested the changes on three RC apps, and each feature works as expected. Kindly review the PR.