[DRAFT] Add EVP_read_pw_string

[smittals2]

Issues:

Resolves #ISSUE-NUMBER1
Addresses #ISSUE-NUMBER2

Description of changes:

Describe AWS-LC’s current behavior and how your code changes that behavior. If there are no issues this pr is resolving, explain why this change is necessary.

Call-outs:

Point out areas that need special attention or support during the review process. Discuss architecture or design changes.

Testing:

How is this change tested (unit tests, fuzz tests, etc.)? Are there any testing steps to be verified by the reviewer?

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.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 68.47291% with 64 lines in your changes missing coverage. Please review.

Project coverage is 78.82%. Comparing base (7d9cbf3) to head (fa2e7d8).
Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
crypto/fipsmodule/evp/evp.c	0.00%	29 Missing ⚠️
crypto/pem/pem_passwd.c	79.56%	19 Missing ⚠️
crypto/pem/pem_lib.c	0.00%	14 Missing ⚠️
crypto/pem/pem_test.cc	97.01%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2402      +/-   ##
==========================================
+ Coverage   78.76%   78.82%   +0.06%     
==========================================
  Files         620      622       +2     
  Lines      107961   108587     +626     
  Branches    15330    15416      +86     
==========================================
+ Hits        85032    85595     +563     
- Misses      22274    22321      +47     
- Partials      655      671      +16     

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