Add Support for Ignoring Warnings in mux Method

[Masterain98]

Context

According to MKVToolNix's documentation, the exit codes are as follows:

0: Muxing completed successfully.
1: Muxing completed with at least one warning. The user is urged to review the warning and resulting file.
2: An error occurred, and mkvmerge aborted.

In my recently usage, I found some media resource failed to mux with exit code 1, and never has a detailed error message.

pymkv2/pymkv/MKVFile.py

Line 407 in a640ffb

error_details = err.decode()

I extracted the command line for the task and ran it directly in PowerShell with no errors. Whereas subprocess must return exit code 1 which in turn causes pymkv to raise an error and end the task prematurely, the fact is that there is nothing wrong with the output. So I decide to ignore the warning.

What's Changed

Previously, the mux method raised an exception for any non-zero exit code, including warnings. This behavior was overly restrictive for scenarios where warnings are acceptable, prompting the need for a more flexible implementation.

In this PR, when ignore_warning is set to True and mkvmerge exits with code 1 (warnings), the method will:

1. Log a warning message indicating that warnings were ignored.
2. Return the exit code without raising an exception.

For exit codes other than 0 or 1, the method raises a ValueError with detailed error output.

ignore_warning is set as False in default.

[GitBib]

Great job! I'll review it.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 66.73%. Comparing base (d0ef1cd) to head (3b939c5).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
pymkv/MKVFile.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
- Coverage   66.84%   66.73%   -0.11%     
==========================================
  Files          10       10              
  Lines         947      950       +3     
==========================================
+ Hits          633      634       +1     
- Misses        314      316       +2     

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