Fix(exporter-tokens): Camel case invariant Xlarge and Xsmall strings

[literat]

Description

Converts strings like heading-xsmall to headingXSmall camel case. This is applied only for characters going after the X so it can have some drawbacks.

For instance xxlarge will be transformed to the XXlarge. We can also address this problem. But this should be only applied to the T-shirt sizes.

Additional context

Issue reference

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