Add record insert and edit examples in sample-workers-vite-react

[kostasb]

Extend the sample-workers-vite-react app to demonstrate content insert and update actions such as create new post, edit existing post.

cc @SferaDev

[ishaanbedi]

Hi @kostasb !
I am interested in taking on this issue and would appreciate it if you could assign it to me.
Thank you!

[kostasb]

Hi @ishaanbedi thank you so much for jumping in on this! Contributions to Xata's open source repositories are warmly welcomed. Feel free to submit a PR and @SferaDev and I will review or help if you need any inputs to make progress!