Reorder cryptography folder

[Amxx]

The contracts/utils/cryptography folder is growing a lot betwen 5.3 and 5.4. IMO, it deserves some organisation to not confuse everything. We have the oportunity to organise stuff now. Once 5.4 is released, it will be too late.

sumarry:

• new subfolder contracts/utils/cryptography/signers for Abstract signer and specialized signer. This includes ERC7739 and the new SignerERC7913
• new subfolder contracts/utils/cryptography/verifier for verifier contracts (following ERC-7913)
• isValidSignatureNow(bytes,bytes32,bytes) in Signature verifier (7913 variant of the 1271 version already in the library)

Alternative to #5659 for v5.4

PR Checklist

• Tests
• Documentation
• Changeset entry (run npx changeset add)

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[gonzaotc]

Seems good to me

[ernestognw]

Made some changes in how documentation is generated in community repo, so that we can have a subsection exclusive for cryptography.

I'll port them over here

[ernestognw]

LGTM. Will try to reenable Netlify's preview before merging to check how it renders

[ernestognw]

Here's how the API section looks in the docs. I also got the preview back (🥳 )

I'd like to merge the Token > Common into just Token, but that would be breaking from an SEO perspective. I think the current version is well organized and keeps old documentation links

[cshein45]

Movement

[Amxx]

@ernestognw

I'd like to merge the Token > Common into just Token

#5498