Expose pLLD Controls via PXZE

[BioCam]

The gateway to advanced LLD, liquid height probing, volume probing, foam detection, ... :)

[Copilot]

Pull request overview

This PR exposes advanced pressure-based liquid level detection (pLLD) controls through a new PXZE command wrapper, enabling features like liquid height probing, volume probing, and foam detection. The implementation adds comprehensive support for configuring both pressure LLD and optional capacitive LLD (cLLD) parameters.

Key Changes:

• Introduced PressureLLDMode enum for liquid vs. foam detection modes
• Added dispensing drive unit conversion utilities (volume ↔ mm ↔ increments)
• Implemented move_tip_to_liquid_surface_using_plld_and_optional_clld() method with extensive parameter validation

Comments suppressed due to low confidence (1)

pylabrobot/liquid_handling/backends/hamilton/STAR_backend.py:1

• Missing space before 'and' in the assertion error message. Should be f" and {STARBackend.z_drive_increment_to_mm(15_000)}"

import asyncio

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[rickwierenga]

because the clld measurement can't be quried, calling it "dual" probing is weird imo, it's just "extra check". maybe call it _plld_probe_z_height with parameter clld_verification_using_channel?

[rickwierenga]

renamed the low level firmware method to _search_for_surface_using_plld to differentiate it more clearly from plld_probe_z_height_using_channel (which has more features like the other probe methods, which depend on C0)