Cairo0 hint pow

[MaksymMalicki]

No description provided.

[quasilyte]

I don't think that it would work if you try running it on a compiled code.
This is why I recommend testing every hint locally on a full run at least once.
Our tests only check for an internal implementation and they're not taking the execution context into account.
It would be inconvenient to merge an implementation that passes our CI tests (as our testing approach is flawed right now) and then discover that some of the hints are not working on the integration level.

To run the code, you need to compile a Cairo file with cairo-compile and then run the cmd/cli over that compiled JSON. The Cairo file should contain the pow function calls. You can use serialize_word to print the output. Compare it with cairo-run output to validate the results.

There is also an issue that even if this hint is implemented, it would fail due to #284.
This is the reason why I re-assigned the hint-related issue to myself as it has some blockers.