[SPIKE] Investigate whether `cose-rust` can replace `aws-nitro-enclaves-cose` to provide EC crypto and RSA crypto

[7flying]

The cose-rust crate was identified as a candidate to replace aws-nitro-enclaves-cose since the later one does not support RSA keys, a requirement of the FDO standard.

• Double check that cose-rust supports all the required crypto protocols specified by the FDO standard: https://fidoalliance.org/specs/FDO/FIDO-Device-Onboard-PS-v1.1-20220419/FIDO-Device-Onboard-PS-v1.1-20220419.html#cose-signatures
• If so, investigate whether we can replace all the instances of aws-nitro-enclaves-cose from our code in favour of cose-rust.

[7flying]

Linked to #627

[7flying]

coset might be another option instead of cose-rust