feat(rust/signed-doc): CBOR encoder using minicbor

[no30bit]

Description

Migrating signed-doc encoding from coset to minicbor.

Related Issue(s)

Closes #332

Description of Changes

• Refactored the document builder to be more general.
• Implemented used COSE logic.
• Refactored ContentType, ContentEncoding and DocumentRef to minicbor.

Breaking Changes

• serde support removed for signed_doc.
• ciborium and coset support removed.
• Builder type is refactored a lot.

Related Pull Requests

#338

Please confirm the following checks

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream module