- Optimized tilt counting data by reducing the tilt counter variables into one for smaller memory footprint. So the `relay_chn_tilt_counter_t` type is replaced by a single `uint16_t` variable in the `relay_chn_tilt_ctl_t` structure. Hence the `relay_chn_tilt_counter_t` type has been removed since it is not necessary anymore.
- Refactored tilt count handling in NVS: consolidate forward and reverse counts into a single tilt count parameter.
- Updated NVS test files that affected by the data type and function signature changes.
Fixes #1079
- Introduced NVS configuration options in Kconfig.
- Implemented NVS initialization and deinitialization in relay_chn_core.
- Added functions for storing and retrieving relay channel direction and tilt sensitivity in NVS.
- Updated relay_chn_tilt and relay_chn_output to utilize NVS for state management.
- Created relay_chn_nvs.c and relay_chn_nvs.h for NVS-related functionalities.
Closes #1074.
