Allow override props

[joaom00]

Allow consumers to override component's props. Some examples where it can be useful:

• Provide a custom aria-label to Command.Loading
• Although this is not the main use case of this lib, makes possible to override aria-expanded on Command.Input to build an accessible combobox where the list opens when the focus is on the input or after typing.

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Name	Status	Preview	Comments	Updated (UTC)
cmdk-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 8, 2023 11:31am

[tonyfarney]

This modification would allow us to workaround accessibility issues the library has. For example: https://github.com/pacocoursey/cmdk/issues/179

Please merge the PR.