Fixes to get the public context running again

[HenningSE]

This PR aims to get the public context running again. The most important changes are summarized below.

S1 LCE Correction Map Refactor

• Added a new function lce_from_pattern_map in context_utils.py to build an S1 LCE correction map directly from an S1 pattern map, and registered it as a URLConfig endpoint. This makes LCE map construction modular and reusable.
• Updated the S1PhotonHits plugin to use the new lce_from_pattern_map function via a straxen.URLConfig entry for s1_lce_correction_map, simplifying configuration and improving maintainability.
• Removed the manual LCE map construction from the setup method in S1PhotonHits, as it is now handled by the new URLConfig mechanism.
• The goal of this change is to simplify the usage of DummyMaps for the LCE map. The functionality remains unchanged.

Map Handling Improvements

• Enhanced the DummyMap class to support initialization from a map dictionary, allowing it to be used seamlessly with maps produced or modified outside the class (e.g., by lce_from_pattern_map).

Data Type Consistency

• Ensured that timing arrays returned by singlet_triplet_delays and _luminescence_timings_simple in s2_photon_propagation.py are always of type np.int64, preventing downstream type errors. [1] [2]

Other

• Added a missing conditional for the comsol field distortion model in electron_drift.py to ensure it is only used when the comsol option is actually used.