[Feature]: Unify MoE "Oracles" with Class Structure

🚀 The feature, motivation and pitch

We currently have the following MoE "oracles", which select the right MoE kernel for each model

• model_executor/layers/fused_moe/oracle

We have:

• fp8
• nvfp4
• mxfp8
• unquantized

and will soon have mxfp4

Each of these has the following functions:

• select_XX_moe_backend - called by the quantization integration to get the backend
• convert_to_XX_moe_kernel_format - called by the quantization integration to shuffle the weights
• make_XX_moe_quant_config - called by the quantization integration to make the quant config
• make_fp8_moe_kernel - called by the quantization integration to construct the kernel

Now that we have the structure standardized, we need to create a generic class that implements this logic. Then, each oracle can inherit from this.

So, we would have the following:

class MoEKernelOracle(ABC)
 ...

class Fp8MoEKernelOracle(MoEOracle):
 ...

and so on and so forth

Alternatives

just use conventions. this is a bad idea due to drift and duplicated code

Additional context

No response

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