Migrate signature verification tests (ECDSA, DSA, EdDSA) from
third_party/wycheproof_testvectors/ to the new third_party/vectors/
system with proper traceability.

Test vectors added:
- 10 ECDSA test files (secp224r1, secp256r1, secp384r1, secp521r1,
  secp256k1 with SHA-224, SHA-256, SHA-384, SHA-512)
- 4 DSA test files (2048-bit and 3072-bit keys with SHA-224, SHA-256)
- 1 EdDSA test file (Ed25519)

Changes:
- Add upstream JSON test vectors and converted txt files
- Update evp_test.cc with new paths and duvet annotations for
  traceability
- Update sources.cmake with new test vector paths
- Add backward compatibility in RunWycheproofVerifyTest() to support
  both publicKeyDer (new format) and keyDer (old format) for unmigrated
  tests
- Remove old test vector files that have been migrated
- Update duvet snapshot and vectors_spec.md

All tests pass with the new test vectors.

Migrate RSA PKCS#1 signature tests from third_party/wycheproof_testvectors/
to the new third_party/vectors/ system with proper traceability.

Test vectors added:
- 9 RSA signature verification test files (2048, 3072, 4096, 8192-bit keys
  with SHA-224, SHA-256, SHA-384, SHA-512)
- 5 RSA signature generation test files (1024, 1536, 2048, 3072, 4096-bit
  keys including weak key sizes for compatibility testing)

Changes:
- Add upstream JSON test vectors and converted txt files
- Update evp_test.cc with new paths and duvet annotations for traceability
- Update sources.cmake with new test vector paths
- Update converter to handle privateKeyPkcs8 field for signature generation
- Remove old test vector files that have been migrated

Previous test coverage maintained:
- rsa_signature_test.txt (377 tests) superseded by specific key size files
  providing comprehensive coverage (2169+ tests)
- rsa_sig_gen_misc_test.txt superseded by rsa_pkcs1_*_sig_gen_test.txt
  files with explicit key sizes

All tests pass with the new test vectors.

Migrate RSA PKCS#1 v1.5 decryption tests from third_party/wycheproof_testvectors/
to the new third_party/vectors/ system with proper traceability.

Test vectors added:
- 3 RSA PKCS#1 v1.5 decryption test files (2048, 3072, 4096-bit keys)

Changes:
- Add upstream JSON test vectors and converted txt files
- Update evp_test.cc with new paths and duvet annotations for traceability
- Update sources.cmake with new test vector paths
- Remove old test vector files that have been migrated
- Update vectors_spec.md

All tests pass with the new test vectors.

Update generate_spec.py to use a custom sort key that groups test files
by common prefix. This ensures related test files appear consecutively
in vectors_spec.md, making duvet annotations cleaner.

Changes:
- Add _sort_key() function that strips test suffixes and trailing
  numeric/hash components to extract base names
- Sort by (base_name, test_type, full_name) tuple where test_type
  orders sig_gen_test before plain _test
- Remove blank lines between individual requirements (only between
  source sections)

This groups files like:
- rsa_pkcs1_*_sig_gen_test.txt (all together)
- rsa_pkcs1_*_test.txt (all together)
- rsa_signature_*_test.txt (all together)

Allows consecutive duvet annotations without blank line separators.

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