Create a better builder pattern struct for `BonesBevyRenderer`.

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https://github.com/fishfolk/bones/blob/6164d3524c3628b9d7f00f8b57c68a7cc8eb698d/framework_crates/bones_bevy_renderer/src/lib.rs#L108-L115

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This issue was generated by todo-issue based on a TODO comment in 6164d3524c3628b9d7f00f8b57c68a7cc8eb698d.