- 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
- Removed unnecessary calls to relay_chn_create and g_is_component_initialized in multiple test cases across test_relay_chn_core_single.c, test_relay_chn_listener_multi.c, and test_relay_chn_listener_single.c.
- Introduced new test files for NVS functionality: test_relay_chn_nvs_multi.c and test_relay_chn_nvs_single.c, covering initialization, direction setting, invalid parameters, and erase operations.
- Updated partition table configuration to support NVS storage, including the addition of a new partition file part_nvs.csv.
- Adjusted sdkconfig files to enable NVS support and configure custom partition settings for relay channels.
