Add loading indicator when executing `cllm search` command

[devleejb]

What would you like to be added?

I would like to propose adding a loading indicator when executing the cllm search command in order to provide feedback to users that the command is being processed.

Why is this needed?

Currently, there is no loading indicator displayed while the cllm search command is running. This can lead to confusion for users as they are unsure if the command is still in progress or if it has completed. By adding a loading indicator, users will have a better understanding of the command's progress and know that their input is being processed.