Reduce number of tokens / remove dead tokens

[pylapp]

Context

Today with for example version v0.21.0 we have 1,971 tokens (403 core raw tokens, 79 Orange brand raw tokens, 50 Sosh brand raw tokens, 139 Wireframe brand raw tokens, 967 core semantic tokens, 333 core component tokens).
These tokens are mostly defined in Figma, then exposed thanks to the tokenator in Swift code.

But it is possible some of these tokens are not used, maybe because an issue in the conception of the component or because in the end the token is not mandatory.

Reducing the number of tokens will reduced the weight of the repository to be cloned when projects downloads it. In addition, it will reduce the memory used to store them for nothing.

Removing useless tokens will help users find the ones they need without being polutted / disturbed by the number of tokens too big.

Dead code tools like periphery are not enough as because tokens are public it will ignore them.

Related to #935

Definition of Done

• Make a Python script, in scripts folder of the library, extracting all component, semantic and raw tokens (from protocols and enums extensions). Then, for each of these token, check if the token is used (i.e. excluded tests and tokens providers). If not, log it.
• Write the list of tokens (here for example) not used
• Check with design where they should be used
• If not used, remove them from tokenator and code bases
• Compute the memory saved and the weight of the repo