[Spec Decoding] Merge jitted helpers for eagle3

[Lumosis]

Description

Pre-compilation PR will come later.
Next step: avoid waiting for TPU->CPU transfer,

Tests

UTs tested.

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[github-actions]

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[py4]

if a jitted function is only used within another jitted function, where is no point in marking that function as jitted as things get inlined anyway

[py4]

Let's fix the acceptance rate issue to make sure we are not introducing regression

[py4]

Can we also rename some of these functions? We have so many prepare_inputs_" names. It's a bit difficult to understand what's the difference between prepare_inputsandprepare_inputs_in_jit` for instance. Can we come up with more concrete names? if that makes sense

[Lumosis]

Can we also rename some of these functions? We have so many prepare_inputs_" names. It's a bit difficult to understand what's the difference between prepare_inputsandprepare_inputs_in_jit` for instance. Can we come up with more concrete names? if that makes sense

Done