Implement enc CLI

[nhatnghiho]

Description of changes:

Implement enc CLI with the following options:

• e
• d
• aes-128-cbc
• K
• in
• out
• iv

Testing:

Unit tests

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[github-actions]

clang-tidy made some suggestions

[codecov-commenter]

Codecov Report

❌ Patch coverage is 76.62338% with 54 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.23%. Comparing base (f5e4585) to head (d0c9d87).

Files with missing lines	Patch %	Lines
tool-openssl/enc_test.cc	72.72%	36 Missing ⚠️
tool-openssl/enc.cc	81.81%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2877      +/-   ##
==========================================
+ Coverage   78.22%   78.23%   +0.01%     
==========================================
  Files         683      685       +2     
  Lines      117491   117722     +231     
  Branches    16510    16543      +33     
==========================================
+ Hits        91909    92104     +195     
- Misses      24694    24733      +39     
+ Partials      888      885       -3     

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[justsmth]

I believe the Valgrind failure is this one: https://github.com/aws/aws-lc/actions/runs/20031393257/job/57441202249?pr=2877#step:4:1663