Adds support to be compiled as a windows service.

[hulto]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Allows imix to compile to a windows service exe.

• Tested locally: Service starts successfully
• Made sure it called back
• Add docs to compile for windows service

Which issue(s) this PR fixes:

Fixes #375

[Cictrone]

lgtm, windows is sus

[codecov]

Codecov Report

Attention: 33 lines in your changes are missing coverage. Please review.

Comparison is base (e2e9a57) 71.55% compared to head (5439c4a) 71.59%.

Files	Patch %	Lines
implants/imix/src/lib.rs	0.00%	31 Missing ⚠️
implants/imix/src/main.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #604      +/-   ##
==========================================
+ Coverage   71.55%   71.59%   +0.03%     
==========================================
  Files         166      167       +1     
  Lines       10999    10993       -6     
==========================================
  Hits         7870     7870              
+ Misses       2950     2944       -6     
  Partials      179      179              

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