This update adds a user profile signature command to the Odoo editor, allowing users to easily include their signature in documents. This change simplifies the process of adding professional signatures and aligns with user preferences. The update refactors the signature plugin to improve modularity and reduce dependencies.

*=[accountant_knowledge, knowledge, sign]
Purpose of this PR:

- Add a new Signature command to insert the user's profile signature defined in user preferences. This is handled by UserSignaturePlugin and and is part of the main editor plugins.
- Keep the existing Signature plugin restricted to Email Marketing & Knowledge.

task-6127297

This update adds functionality to generate reports required by Spanish tax authorities (AEAT) for the Modelo 180 tax return. It includes wizards for data export and submission, streamlining the process for businesses operating in Spain to comply with tax regulations. This improves reporting accuracy and simplifies the filing process.

**task**-5902868