Python: add opcodes for safe py-drivers

The following opcodes have been added, see [0] for details:

- LIST_TO_TUPLE: convert a list to a tuple,
  use for constructing lists/tuples in some cases.

- LIST_EXTEND: use for constructing lists with unpacking.

- SET_UPDATE: use for constructing sets with unpacking.

- CONTAINS_OP: check if `a in b` generally useful.

When writing tests these op-codes where needed for basic operations
and can be safely supported.

Add note why dictionary manipulation op-codes have been left out.

Also restrict namsepace access to anything with an underscore prefix
since these may be undocumented.

[0]: https://docs.python.org/3.10/library/dis.html

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