feat: Use load animation

[NihalRadhakrishna]

Problem

When user clicks on open existing project button or edit project button it shows "loading..." text.

Proposed solution

We can add loading animation using mui circular progress component.

Additional context

Mockups

Part of

[NihalRadhakrishna]

Something like this...

[aashimawadhwa]

I would like to take this issue.

[alexgarel]

@aashimawadhwa just tell you gonna take it and it's yours :-) (if no one already signal he is on it).

[NihalRadhakrishna]

@aashimawadhwa can I pls take this issue since I opened it. I've already got it working on my local setup.