[SYSTEMDS-3751, SYSTEMDS-3752, SYSTEMDS-3753] Python API missing buitin isNA, isNaN, isInf

[e-strauss]

[SYSTEMDS-3751, SYSTEMDS-3752, SYSTEMDS-3753] Python API missing buitin isNA, isNaN, isInf

This patch adds the built in operator for isNA, isNaN, isInf to the python api.

[Baunsgaard]

is this operation only valid for matrices, if that is the case, we need to fix it in the system in general.
If not, we need to add it to the scalar node as well.

[e-strauss]

is this operation only valid for matrices, if that is the case, we need to fix it in the system in general. If not, we need to add it to the scalar node as well.

I will check that

[e-strauss]

updated for scalar as well

[Baunsgaard]

LGTM, merged, while merging i formatted the test, it is only minor things.
I can suggest that you adhere to the 'black' formatted code, since this is the auto formatter that I 'unofficially' use for the code in the Python API.