Implement `FastCircle` component

[EVAST9919]

Adresses https://github.com/ppy/osu-framework/issues/6067, https://github.com/ppy/osu/issues/21495

Pros:

• No nested Box drawable (adds up in demanding scenarios)
• Correct masking when used inside CircularContainer
• No overhead from masking info and no batch breaking in cases when multiple circles are being drawn consecutively (though I think SSBO supposed to fix that?)

Cons (which are holding me back from replacing current Circle implementation with this one):

• Circle is no longer a container (so is the Box which I think is fine)
• No ability to set masking-related effects directly (again Box has the same properties)
• Points above might be considered a breaking change, but easily fixeable by using CircularContainer instead
• Texture coordinates abuse to pass draw size into the shader without uniform buffers
• Has a separate shader

Performance comparison in demanding scenarios:

master	pr