[ESI] Add skid buffer to Cosim_Endpoint_ToHost

[teqdruid]

It has been observed that some simulators (verilator) does not handle combinational driving from DPI well (resulting in non-determinism wrt. some of the combinational outputs being dropped/replicated). Questa does not show this behavior. A mitigation is to add a skid buffer to decouple the DPI interface from the output interface. Use the existing skid buffer from ESIPrimitives.

[Copilot]

Pull Request Overview

This PR adds a skid buffer to the Cosim_Endpoint_ToHost module to mitigate non-deterministic behavior observed in some simulators (specifically Verilator) when handling combinational driving from DPI interfaces. The solution uses an existing ESI_PipelineStage primitive to decouple the DPI interface from the output interface.

Key changes:

• Introduces intermediate pipeline signals (DataOut_a_*) to buffer data from DPI calls
• Replaces direct DataOut assignments with a skid buffer implementation using ESI_PipelineStage
• Updates the control logic to work with the new buffered approach

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[teqdruid]

@mortbopet feel free to merge if you approve.