Refactoring, performance, and more

• Refactoring for future extensibility.
• Reimplements the XML serializer for most simple types, gaining speed and a dramatic reduction in memory allocations (specially on .net 6+).
• Uses ObjectPool and ArrayPool to reduce pressure on the GC.
• The SELECT TOP(n) optimization can be turned off via an options parameter at configuration time:

...
builder.UseQueryableValues(options =>
{
    options.UseSelectTopOptimization(false);
})
...

• Avoids the logging of redundant warnings when initialized.

That's all for now! 👋