[issue22117] Rewrite pytime.h to work on nanoseconds

[STINNER Victor]

STINNER Victor added the comment:

Instead of a complex structure, we can use a 64-bit signed integer to store a number of nanoseconds. For a UNIX epoch, nanoseconds since January 1st 1970, the min/max are:
1677-09-21 00:12:43.145224
2262-04-11 23:47:16.854776

The Linux kernel is going to use 64-bit integer even on 32-bit CPU to store timestamps, to simplify the code (to avoid the structure).

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