Split battery-related messages into two files

[sdomoszlai13]

To improve support for smart batteries and decrease log file sizes, two battery-related uORB topics are going to be used:

• BattreyInfo.msg: Contains static (unchanged during flight) battery-related info like the battery serial number. Logged with a low frequency
• BatteryStatus.msg: Contains dynamic (changed during flight) battery-related info like the current cell voltages. Logged with a high frequency

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