Closes https://github.com/espressif/esp-idf/issues/7826
* nvs_entry_find(), nvs_entry_next() and nvs_entry_info()
return error codes now
* nvs_entry_find() and nvs_entry_next() access/modify iterator via
parameters, instead of returning an new iterator.
Added appropriate documentation in Chinese and English
change: alignment for data partitions is now 4kB instead of 4B
remove: STRICT_DATA_ALIGNMENT variable
remove: warning tests for misaligned partitions
add: assertion test for misaligned partitions
add: breaking change documentation