Make modules case insenstive on windows

[tevoinea]

Summary of the Pull Request

What is this about?

Closes #3525

Info on Pull Request

What does this include?

• Binary and source coverage allowlists are now case insensitive on Windows
• Modules that are loaded on Windows are tracked internally in a case insensitive way
• Tests

Validation Steps Performed

How does someone test & validate?

• Added a test that a source allowlist of inlinee.exe will pick up a binary compiled as Inlinee.exe
• Added a test that the modules loaded from Inlinee.exe are all only lowercase

[codecov-commenter]

Codecov Report

Merging #3527 (b67e3bb) into main (e3c4a40) will increase coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3527      +/-   ##
==========================================
+ Coverage   39.40%   39.45%   +0.04%     
==========================================
  Files         300      300              
  Lines       36381    36419      +38     
==========================================
+ Hits        14336    14368      +32     
- Misses      22045    22051       +6     

Files	Coverage Δ
src/agent/coverage/src/allowlist.rs	90.72% <100.00%> (-0.10%)	:arrow_down:
src/agent/coverage/src/allowlist/tests.rs	100.00% <100.00%> (ø)
src/agent/coverage/src/source.rs	94.11% <100.00%> (+1.48%)	:arrow_up:
src/agent/debugger/src/module.rs	70.09% <ø> (ø)
src/agent/onefuzz/src/expand.rs	83.24% <100.00%> (+0.08%)	:arrow_up:

... and 3 files with indirect coverage changes