Tasks hash ids update when run function definition changes

[ujiuji1259]

I’ve added get_own_code method so that unique id can be updated when the task definition changes (requested in #216 ).

In the following example (in examples/gokart_notebook_example.ipynb), get_own_code got the codes of run, requires. By adding this into dependencies of hash_id, the task rerun without manually changing __version when the script is changed.

This PR is related to #205 from @hiro-o918

[hirosassa]

@ujiuji1259 Thank you for the GREAT contribution! Please add unit test for the get_code and make_unique_id to confirm this feature runs correctly.

[vaaaaanquish]

Thx. plz update document :)

[mski-iksm]

Thank you for great contribution!

I think the description should be something like,

If this is true, even if all outputs are present, this task will be executed if any changes have been made to the code.

instead of

If this is true, this task will not run only if all input and output files exist, and this task class is modified.

[ujiuji1259]

I've added tests for get_own_code and output path (≒ unique id), and updated description!

[ujiuji1259]

I've updated the document in docs/task_on_kart.rst, and it passed unittest in the local environment(py3.9). Could you approve the workflow?

[Hi-king]

@ujiuji1259 Thx for great feature! We'll release new version including this feature :)

[Hi-king]

And thx again to @hiro-o918 for inspirational feature! #205

[hiro-o918]

Thank you for awesome new features! I’m looking forward to using it!☺️