Add Command.ExecuteAsync(...) overload that allows direct manipulation of ProcessStartInfo/Process

[Tyrrrz]

Closes #79

Example usage:

var cmd = Cli.Wrap(...);

var result = await cmd.ExecuteAsync(
    startInfo =>
    {
        startInfo.RedirectStandardInput = false;
        startInfo.RedirectStandardOutput = false;
        startInfo.RedirectStandardError = false;
        startInfo.CreateNoWindow = false;
    },
    process =>
    {
        process.PriorityBoostEnabled = true;
    }
);

Note that using this overload is reserved for very rare edge cases where you need to break out of CliWrap's abstraction model (such as #79) and configure the low-level process properties/behavior manually. Do not rely on it in the general case.

If something breaks when using this overload, you're on your own.

[Copilot]

Pull Request Overview

This PR adds a new overload for Command.ExecuteAsync that enables direct configuration of the underlying ProcessStartInfo and Process, catering to edge cases where the CliWrap abstraction needs to be bypassed.

• Introduces a new overload accepting configuration actions for ProcessStartInfo and Process.
• Retains the previous overload by internally calling the new one with null configuration actions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.03%. Comparing base (9b9384d) to head (79e45dc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #290      +/-   ##
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+ Coverage   95.01%   95.03%   +0.02%     
==========================================
  Files          48       48              
  Lines        1203     1208       +5     
  Branches       89       95       +6     
==========================================
+ Hits         1143     1148       +5     
  Misses         37       37              
  Partials       23       23              

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