feat: add aot sandbox

[TimothyMakkison]

Added aot sandbox file

• Don't know if the name should be AotSandbox or SandboxAot
• Technically works in aot 👍

When creating this I noticed that the first example in the readme doesn't work. Perhaps the readme should be updated?

public interface IGitHubApi
{
    [Get("/users/{user}")]
    [Headers("User-Agent: Refit")] // github expects a user-agent otherwise it returns forbidden
    Task<User> GetUser(string user);
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.51%. Comparing base (6ebeda5) to head (a7e8505).
Report is 180 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1969      +/-   ##
==========================================
- Coverage   87.73%   85.51%   -2.22%     
==========================================
  Files          33       36       +3     
  Lines        2348     2506     +158     
  Branches      294      365      +71     
==========================================
+ Hits         2060     2143      +83     
- Misses        208      285      +77     
+ Partials       80       78       -2     

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