CatBox Client Abstraction & Error Handling

[ChaseDRedmon]

1. Organize Requests and Clients into subfolders;
2. Rename CreateAlbumRequest.cs to RemoteCreateAlbumRequest.cs.
3. Add LocalCreateAlbumRequest.cs to create albums on catbox while uploading local files.
4. Create abstraction for Local and Remote Requests: AlbumCreationRequest.cs.
5. Begin work on CatBox client abstraction layer and created a method to upload files and create an album in one step.
6. Working on better error handling from the API side of things.

[ChaseDRedmon]

1. Moved some files around to organized the folder structure.
2. Removed throw new methods to replace them with the built in Throw helper class.
3. Abstracted away Create and Upload album requests under new IAlbumUploadRequest interface to simply CatBox service class and method calls. Removed CreateAlbumRequest types as they are consolidated under the introduction of the AnyOf union dependency that was added to the project to reduce the number of Request types in the library

Will work on a list of breaking changes from 0.3 -> 0.4 later on

[formlesstree4]

Could just do

    public static void IfNull([DoesNotReturnIf(true)] object? s, [CallerArgumentExpression("s")] string memberName = "")
    {
        ArgumentNullException.ThrowIfNull(s, memberName);
    }

[ChaseDRedmon]

Since the library includes a minimum target to .NET Standard 2.1 (the minimum version for C# 8 to support async-enumerables), the ArgumentNullException.ThrowIfNull isn't present in the BCL at this point. That was added in a later version of .NET

[ChaseDRedmon]

Latest feedback has been taken into consideration and committed into codebase