feat(tuya): update TRV603WZ definition and add converters

[pe-pe]

TL;DR

• Refactor/improve TRV603WZ definition to better match device capabilities.
• Add divideByWithLimits to valueConverterBasic
• Add thermostatHolidayStartStopUnixTS and thermostatScheduleDayMultiDP_TRV603WZ to valueConverter

New Functions:

• valueConverterBasic.divideByWithLimits: Divides value by a factor and clamps it within min/max limits. Useful for setpoints that report invalid values when heating is disabled.
• valueConverter.thermostatHolidayStartStopUnixTS: Converts 8-byte big-endian Unix timestamp pairs to/from a string format "YYYY/MM/DD HH:MM | YYYY/MM/DD HH:MM".
• valueConverter.thermostatScheduleDayMultiDP_TRV603WZ: Handles 8-pair schedule per day for TRV603WZ, encoding time and temperature into a custom byte format.

Fixed(new) Features:

• holiday_mode, which was invalid (binary), is replaced by holiday_time with the new thermostatHolidayStartStopUnixTS converter.
• schedule_<day> which was invalid/not-exposed is now correctly handled with the new thermostatScheduleDayMultiDP_TRV603WZ converter.

Breaking Changes:

Below changes are introduced in order to better align with climate control and HomeAssistant GUI components:

• heating_stop is replaced by system_mode (auto/off).
• mode is replaced by preset (schedule/manual/holiday).

Below changes are introduced to align to other thermostats and for clarity:

• window is renamed to window_open
• switch_scale is renamed to anti_scale

[Koenkk]

Thanks!