BUILD: Move to Poetry

[mtsokol]

WIP

First https://github.com/pydata/sparse/pull/646 needs to be merged.

[github-actions[bot]]

Test Results

2 tests   - 5 897   2 :white_check_mark:  - 5 865   6m 14s :stopwatch: + 2m 55s 1 suites ±    0   0 :zzz:  -    32  1 files   ±    0   0 :x: ±    0 

Results for commit c30f0c4f. ± Comparison against base commit 32e6e0b1.

This pull request removes 5899 and adds 2 tests. Note that renamed tests count towards both.

``` sparse.pydata_backend.tests.test_array_function ‑ test_binary[dot-arg_order0] sparse.pydata_backend.tests.test_array_function ‑ test_binary[dot-arg_order1] sparse.pydata_backend.tests.test_array_function ‑ test_binary[dot-arg_order2] sparse.pydata_backend.tests.test_array_function ‑ test_binary[matmul-arg_order0] sparse.pydata_backend.tests.test_array_function ‑ test_binary[matmul-arg_order1] sparse.pydata_backend.tests.test_array_function ‑ test_binary[matmul-arg_order2] sparse.pydata_backend.tests.test_array_function ‑ test_binary[result_type-arg_order0] sparse.pydata_backend.tests.test_array_function ‑ test_binary[result_type-arg_order1] sparse.pydata_backend.tests.test_array_function ‑ test_binary[result_type-arg_order2] sparse.pydata_backend.tests.test_array_function ‑ test_binary[tensordot-arg_order0] … ``` ``` sparse.tests.test_backends ‑ test_finch_backend sparse.tests.test_backends ‑ test_finch_backend_2 ```

:recycle: This comment has been updated with latest results.

[hameerabbasi]

Ouch, segfault in CI; that's not good.

[hameerabbasi]

xref JuliaPy/PythonCall.jl#472