gh-117398: datetime: Use wrappers for C-API functions #118115
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This introduces the following wrapper functions for the public C-API, so that the wrapped functions can have more arguments, such as a module state:
new_datetime_nofold_capi()wraps thenew_datetime_exfuncionnew_time_nofold_capi(), renamed fromnew_time_ex, as it is internally unused.new_timezone_capi()wraps thenew_timezonefuncionnew_datetime_capi()wraps thenew_datetime_ex2funcionnew_time_capi()wraps thenew_time_ex2funcionnew_date_capi()wraps thenew_date_exfunctionnew_delta_capi()wraps thenew_delta_exfunctiondatetime_fromtimestamp_capi()wraps thedatetime_fromtimestampfunctionSubsequently, some internal
*_ex?()functions are renamed as well.The wrappers need to get a module state from the C-API class or a given object's type.
cc @vstinner @erlend-aasland: I'd like to prepare as much as possible.