Fix Windows/ARM64 assembly build

[justsmth]

Issues:

• Addresses: Linkage error when cross-compiling for aarch64-pc-windows-msvc aws-lc-rs#453

Description of changes:

• When building for Windows/ARM64 with the "Visual Studio" generator (instead of Ninja) the "*.S" assembly source files for libraries are ignored.
• This change provides a custom command to assemble the require objects files and adds them to the list of sources for the library.

Call-outs:

• See related aws-lc-rs PR: Test more windows targets aws-lc-rs#452

Testing

• I've added CI tests to build for Windows using the "Visual Studio" generator.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 78.22%. Comparing base (a0e8da9) to head (f56f9f5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1697      +/-   ##
==========================================
- Coverage   78.22%   78.22%   -0.01%     
==========================================
  Files         571      571              
  Lines       95519    95519              
  Branches    13700    13699       -1     
==========================================
- Hits        74721    74720       -1     
- Misses      20188    20191       +3     
+ Partials      610      608       -2     

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