crypto: unify asymmetric key import through KeyObjectHandle::Init

[panva]

[will rebase after #62480, bdfec98 is what this will be]

Consolidate all asymmetric key import paths (DER/PEM, JWK, raw) into a single KeyObjectHandle::Init() entry point with a uniform signature.

Remove the per-type C++ init methods (InitECRaw, InitEDRaw, InitPqcRaw, InitJwk, InitECPrivateRaw) and their JS-side callers, replacing them with shared C++ and JS helpers.

createPublicKey, createPrivateKey, sign, verify, and other operations that accept key material now handle JWK and raw formats directly in C++, removing redundant JS-to-C++ key handle round-trips.

[nodejs-github-bot]

Review requested:

• @nodejs/crypto
• @nodejs/security-wg

[codecov]

Codecov Report

❌ Patch coverage is 86.24484% with 100 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.70%. Comparing base (f3633ef) to head (bdfec98).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/crypto/crypto_keys.cc	75.32%	31 Missing and 44 partials ⚠️
src/crypto/crypto_ec.cc	81.81%	3 Missing and 7 partials ⚠️
lib/internal/crypto/keys.js	89.70%	6 Missing and 1 partial ⚠️
src/crypto/crypto_ml_dsa.cc	88.67%	1 Missing and 5 partials ⚠️
lib/internal/crypto/webcrypto_util.js	98.92%	0 Missing and 1 partial ⚠️
src/crypto/crypto_rsa.cc	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62499      +/-   ##
==========================================
- Coverage   91.54%   89.70%   -1.84%     
==========================================
  Files         351      693     +342     
  Lines      147704   213849   +66145     
  Branches    23214    40959   +17745     
==========================================
+ Hits       135214   191841   +56627     
- Misses      12235    14061    +1826     
- Partials      255     7947    +7692     

Files with missing lines	Coverage Δ
lib/internal/crypto/aes.js	89.89% <100.00%> (+1.43%)	⬆️
lib/internal/crypto/cfrg.js	93.23% <100.00%> (-1.24%)	⬇️
lib/internal/crypto/chacha20_poly1305.js	92.05% <100.00%> (-0.72%)	⬇️
lib/internal/crypto/cipher.js	97.94% <100.00%> (ø)
lib/internal/crypto/ec.js	94.17% <100.00%> (-0.61%)	⬇️
lib/internal/crypto/kem.js	97.41% <100.00%> (+0.09%)	⬆️
lib/internal/crypto/mac.js	92.70% <100.00%> (+1.57%)	⬆️
lib/internal/crypto/ml_dsa.js	95.39% <100.00%> (+0.35%)	⬆️
lib/internal/crypto/ml_kem.js	92.45% <100.00%> (+0.56%)	⬆️
lib/internal/crypto/rsa.js	94.51% <100.00%> (+2.10%)	⬆️
... and 11 more

... and 455 files with indirect coverage changes

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