[issue36485] Add a way to clear all caches

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

> My initial idea was to add a lightweight module cachesreg with two functions: register() and clear_caches().

If it only has two functions, it could be a sub-module sys.cachesreg

Or a lifecycle module, as the name, dedicated to such kind of functions. Register callback functions for memory low, poweroff system, etc.
I don't want lifecycle module, just provide a possibility.

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<https://bugs.python.org/issue36485>
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