crypto: reject invalid raw key imports

[panva]

Fixes a couple edge cases related to raw key formats in node:crypto.

[nodejs-github-bot]

Review requested:

• @nodejs/crypto

[codecov]

Codecov Report

❌ Patch coverage is 67.69231% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.68%. Comparing base (18f938d) to head (03c121c).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/crypto/crypto_keys.cc	60.37%	2 Missing and 19 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #63134   +/-   ##
=======================================
  Coverage   89.67%   89.68%           
=======================================
  Files         712      712           
  Lines      221251   221305   +54     
  Branches    42393    42417   +24     
=======================================
+ Hits       198413   198481   +68     
+ Misses      14681    14627   -54     
- Partials     8157     8197   +40     

Files with missing lines	Coverage Δ
lib/internal/crypto/keys.js	97.05% <100.00%> (+0.01%)	⬆️
lib/internal/crypto/ml_kem.js	94.66% <100.00%> (ø)
src/crypto/crypto_pqc.cc	85.85% <100.00%> (+3.06%)	⬆️
src/crypto/crypto_keys.cc	71.59% <60.37%> (-1.25%)	⬇️

... and 48 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73191/