Reject overly long RSA ciphertexts

[randombit]

Previously we would ignore leading zero bytes, even if they made the overall text larger than the modulus.

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.01 ⚠️

Comparison is base (74bf5ec) 88.15% compared to head (ee97441) 88.14%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3344      +/-   ##
==========================================
- Coverage   88.15%   88.14%   -0.01%     
==========================================
  Files         615      615              
  Lines       69993    69993              
  Branches     6949     6948       -1     
==========================================
- Hits        61701    61695       -6     
- Misses       5392     5403      +11     
+ Partials     2900     2895       -5     

Impacted Files	Coverage Δ
src/lib/pubkey/rsa/rsa.cpp	85.78% <50.00%> (-0.46%)	⬇️
src/lib/pbkdf/argon2/argon2pwhash.cpp	69.69% <0.00%> (-9.10%)	⬇️
src/lib/asn1/der_enc.cpp	77.63% <0.00%> (-1.32%)	⬇️
src/lib/utils/cpuid/cpuid_x86.cpp	54.05% <0.00%> (-0.62%)	⬇️
src/tests/test_bigint.cpp	90.83% <0.00%> (ø)
src/lib/tls/tls12/tls_record.cpp	92.21% <0.00%> (+0.40%)	⬆️
src/lib/pubkey/dl_group/dl_group.cpp	85.45% <0.00%> (+0.67%)	⬆️
src/lib/pk_pad/iso9796/iso9796.cpp	96.80% <0.00%> (+0.79%)	⬆️

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