Convert PKCS#7 types to GATs

[alex]

This does not currently work because rust-asn1 doesn't handle Asn1Definedby{Readable,Writable} correctly

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (4)

src/rust/cryptography-x509/src/pkcs7.rs:14

• [nitpick] The type parameter name 'Op' is ambiguous. It should be renamed to 'Asn1Op' for better clarity.

pub struct ContentInfo<'a, Op: Asn1Operation> {

src/rust/cryptography-x509/src/pkcs7.rs:22

• [nitpick] The type parameter name 'Op' is ambiguous. It should be renamed to 'Asn1Op' for better clarity.

pub enum Content<'a, Op: Asn1Operation> {

src/rust/cryptography-x509/src/pkcs7.rs:34

• [nitpick] The type parameter name 'Op' is ambiguous. It should be renamed to 'Asn1Op' for better clarity.

pub struct SignedData<'a, Op: Asn1Operation> {

src/rust/cryptography-x509/src/pkcs7.rs:64

• [nitpick] The type parameter name 'Op' is ambiguous. It should be renamed to 'Asn1Op' for better clarity.

pub struct EnvelopedData<'a, Op: Asn1Operation> {