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Add FLEXMEASURES_LP_SOLVER_OPTIONS to configure solver options (#2283)

* Add FLEXMEASURES_LP_SOLVER_OPTIONS to configure solver options

Solver options for the scheduling solver could previously only be set in
code (a hardcoded HiGHS profile in device_scheduler). This adds a
FLEXMEASURES_LP_SOLVER_OPTIONS config dict, merged over that profile so
operators can tune the solver (e.g. {"mip_rel_gap": "1e-4"}) without
patching FlexMeasures.

When the solver is HiGHS, the options are validated against the installed
HiGHS build: an unknown option name, an invalid value, or a feature the
build lacks raises a clear ValueError. This matters because Pyomo's
appsi_highs interface applies options without checking HiGHS' return
status, so a mistake would otherwise be silently ignored (e.g.
solver="hipo" is unavailable in the pip-installed highspy, yet appsi_highs
solves on as if nothing were wrong). Setting threads/parallel logs a
warning about HiGHS' process-global thread scheduler.

Found while investigating SeitaBV/ems#172.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LeqGFrHfGrBHAJyjdAyr3y

* Reference PR #2283 in the changelog entry

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LeqGFrHfGrBHAJyjdAyr3y

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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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