fix: add unique keys to iconNode and children to resolve React errors

[hypervisor]

What is the purpose of this pull request?

• New Icon
• Bug fix
• New Feature
• Documentation update
• Other:

Description

This PR resolves the missing key warnings in the Icon component by adding unique key props to the elements created from iconNode and children.

Closes #2654

Before Submitting

• I've read the Contribution Guidelines.
• I've checked if there was an existing PR that solves the same issue.

[hypervisor]

@ericfennis Good catch, I applied your suggested changes

[jguddas]

I don't think that's a good idea, using indexes as keys is not something we should do.

[ericfennis]

@jguddas This is only when custom icons are added. The icon nodes we provide have random keys generated based on the content.

[jguddas]

My opinion stays the same, we should not do this. If you want to fix the error add keys to your custom icon data, https://lucide-studio.vercel.app does it automatically already.