Support RFC5958 PKCS#8 v2 private keys

[ctz]

This is working towards ed25519 support, and therefore landing #74

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.14%. Comparing base (2ec88ae) to head (5a25682).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #117   +/-   ##
=======================================
  Coverage   99.14%   99.14%           
=======================================
  Files         171      171           
  Lines       39074    39165   +91     
=======================================
+ Hits        38738    38830   +92     
+ Misses        336      335    -1     

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[codspeed-hq]

CodSpeed Performance Report

Merging #117 will not alter performance

_{Comparing jbp-pkcs8-v2 (5a25682) with main (2ec88ae)}

Summary

✅ 143 untouched

[Copilot]

Pull Request Overview

This PR adds support for PKCS#8 v2 (RFC 5958) private key encoding to enable ed25519 support. The changes refactor the ASN.1 parsing infrastructure to handle both explicit and implicit context-specific tagging, which is required for PKCS#8 v2's optional publicKey field.

Key changes:

• Refactored ASN.1 Type trait to support tag-parameterized parsing/encoding via parse_with_tag and encode_with_tag methods
• Renamed ContextConstructed to Context with an EXPLICIT boolean parameter to handle both explicit and implicit tagging
• Updated pkcs8 module to wrap PKCS#8 operations in a Key type that validates version constraints

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
graviola/src/high/asn1.rs	Core ASN.1 refactoring to support tag-parameterized parsing; adds Context type with explicit/implicit tagging support; updates all ASN.1 types to implement new Type trait methods
graviola/src/high/asn1/pkix.rs	Renames PrivateKeyInfo to OneAsymmetricKey per RFC 5958; adds Pkcs8Version enum; marks EcPrivateKey context fields as EXPLICIT
graviola/src/high/pkcs8.rs	Replaces free functions with Key wrapper type; adds version validation for v1/v2; provides construct/decode/encode methods
graviola/src/high/rsa.rs	Updates RSA PKCS#8 encoding/decoding to use new pkcs8::Key API
graviola/src/high/ecdsa.rs	Updates ECDSA PKCS#8 encoding/decoding to use new pkcs8::Key API; changes into_octets to as_octets
graviola/src/high/asn1/oid.rs	Adds id_ed25519 OID definition (1.3.101.112)
graviola/src/high/asn1/testdata/ed25519-p8v2.bin	Adds test data for ed25519 PKCS#8 v2 keys

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