Add entity_resolver module that lets all service parameters accept
HA entity references in place of literal values. The entity's current
state (or a specific attribute via the @attr syntax) is resolved at
call time and coerced to the expected Python type.
Syntax:
"sensor.washing_duration" → uses entity state
"sensor.washing_duration@run_minutes" → uses entity attribute
Apply or_entity_ref() and resolve_entity_references() to all five
service handlers (get_price, find_cheapest_block, find_cheapest_hours,
find_cheapest_schedule, get_chartdata) for every parameter where a
dynamic value from another entity is useful (duration, start/end times,
offsets, etc.).
Add five new translation keys for entity-resolution error messages
(invalid_entity_reference, entity_not_found, entity_attribute_not_found,
entity_state_unavailable, entity_value_conversion_failed) across all
five language files.
Fix pytest warning filter to suppress AsyncMock cleanup noise, and
update test_resource_cleanup to mock hass.config_entries.async_entries
so the blueprint-removal path in async_remove_entry does not raise.
Impact: Automations and scripts can pass sensor entity IDs as service
parameters (e.g. duration from a sensor) instead of having to use
template-based workarounds.
