Add support for bracket object selectors for token function arguments.

[soroush96]

Description

we can't use negative values of the tokens we have set. for example token(sizes.-xl) or token(sizes["-xl"]) wouldn't work.

Problem Statement/Justification

to be able to use some of the non conventional object keys it is better to have bracket selector in use in tokens

Proposed Solution or API

mentioned above

Alternatives

No response

Additional Information

No response

[astahmer]

you can do it like this https://play.panda-css.com/uMLFKDjxw7