Make ChatSidebar collapsible/expandable.

[soh-tetsu]

Description:

In this PR, I have made updates to the ChatSidebar.tsx file. The changes include:

• Introduced a new state variable, isSidebarOpen, to keep track of the sidebar's visibility status.

• Implemented a toggleSidebar function that alternates the sidebar's status between collapsed and expanded states.

• Added a clickable button styled with CSS to trigger the sidebar toggle.

• Installed react-tooltip and use it to show tooltip for sidebar toggle button.

These changes aim to implement an acceptable collapsible ChatSidebar with minimized code modification.

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[yuhongsun96]

It's been added!