Add GetSystemPowerStatus wrapper

[CristiFati]

Wrap [MS.Learn]: GetSystemPowerStatus function (winbase.h).

Test (build locally and overwrite the .pyd):

[cfati@CFATI-5510-0:e:\Work\Dev\GitHub\CristiFati\pywin32\src]> "e:\Work\Dev\VEnvs\py_pc064_03.10_test1_pw32\Scripts\python.exe" -c "import win32api as wapi;from pprint import pprint as pp;pp(wapi.GetSystemPowerStatus(), sort_dicts=0)"
{'ACLineStatus': 1,
 'BatteryFlag': 1,
 'BatteryLifePercent': 100,
 'SystemStatusFlag': 0,
 'BatteryLifeTime': 4294967295,
 'BatteryFullLifeTime': 4294967295}

Worth mentioning [SO]: In Python, how can I detect whether the computer is on battery power? (@CristiFati's answer) (contains explanation of a Python bug).

Note: Failed test seems to be caused by other files.

[mhammond]

I've love to see this at least called by test_win32api, even if the values can't be sanely checked :). However:

'BatteryFullLifeTime': 4294967295}

MSDN documents the function returns -1, so this value is likely to confuse people. I wonder if we should manually handle this value as a special case?

[mhammond]

Thanks!