feat: Port native Audio providers to C#

[Jklawreszuk]

PR Details

The goal of this PR is to make the Stride.Audio module fully working in C#, without worring about C++ build tools.

Todo

• Port OpenAL to Silk.NET.OpenAL - complete and tested on SimpleAudio sample
• Port Celt/Opus to .NET
• Port XAudio to Silk.NET.XAudio - almost complete, but not tested yet
• Port OpenSL ES to .NET - Silk.NET does not provide an OpenSLES wrapper, and Android considers it obsolete.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My change requires a change to the documentation.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have built and run the editor to try this change out. (Only OpenAL)

[Kryptos-FR]

Looks like the whole file got "touched" in the latest commit (maybe the encoding change or the EOL character). Try to keep the encoding on all file to be UTF-8 and EOL to be LF when pushing (but can be CRLF when checking out on Windows). Please check whether the git config option on Windows and Linux are consistent.

[Kryptos-FR]

With that said, sometimes git does the strangest diff and it's out of our control (could be the case here).