[Cython] Add support for list/tuple slicing

[Zaur Shibzukhov]

Hello!

Current Cython generate for slicing of list/tuple general
PySequence_GetSlice/SetSlice call.
We could replace that to native call for Py{List|Tuple}_GetSlice and
PyList_SetSlice for lists/tuples.

Here are the changes:
https://github.com/intellimath/cython/commit/27525a5dc9f6eba31b330a6ec04e7a105191d9f5

Zaur Shibzukhov
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