Remove tests from the wheel and simplify setup.py.

[sputt]

Remove the tests/ directory from the wheel distribution of responses. Wheels are intended to be a production release containing no tests.

Update setup.py removing include_package_data arg, which causes the wheel to contain the tests. Add a pyproject.toml with setup requires and a build backend. Remove references to the deprecated test command of setup tools.

[sputt]

Wheel before

(venv) sputt@sputt-mbp2 responses % unzip -l dist/responses-0.25.3-py3-none-any.whl 
Archive:  dist/responses-0.25.3-py3-none-any.whl
  Length      Date    Time    Name
---------  ---------- -----   ----
    43724  12-27-2024 03:10   responses/__init__.py
     5339  12-27-2024 03:10   responses/_recorder.py
    13654  12-27-2024 03:10   responses/matchers.py
      158  12-27-2024 03:10   responses/py.typed
     4141  12-27-2024 03:10   responses/registries.py
        0  12-27-2024 03:10   responses/tests/__init__.py
    32904  12-27-2024 03:10   responses/tests/test_matchers.py
      977  12-27-2024 03:10   responses/tests/test_multithreading.py
     6897  12-27-2024 03:10   responses/tests/test_recorder.py
     5811  12-27-2024 03:10   responses/tests/test_registries.py
    84936  12-27-2024 03:10   responses/tests/test_responses.py
    10835  12-27-2024 03:25   responses-0.25.3.dist-info/LICENSE
    46718  12-27-2024 03:25   responses-0.25.3.dist-info/METADATA
       91  12-27-2024 03:25   responses-0.25.3.dist-info/WHEEL
       10  12-27-2024 03:25   responses-0.25.3.dist-info/top_level.txt
     1330  12-27-2024 03:25   responses-0.25.3.dist-info/RECORD
---------                     -------
   257525                     16 files

Wheel after

(venv) sputt@sputt-mbp2 responses % unzip -l dist/responses-0.25.4-py3-none-any.whl 
Archive:  dist/responses-0.25.4-py3-none-any.whl
  Length      Date    Time    Name
---------  ---------- -----   ----
    43724  12-27-2024 03:10   responses/__init__.py
     5339  12-27-2024 03:10   responses/_recorder.py
    13654  12-27-2024 03:10   responses/matchers.py
      158  12-27-2024 03:10   responses/py.typed
     4141  12-27-2024 03:10   responses/registries.py
    10835  12-27-2024 04:14   responses-0.25.4.dist-info/LICENSE
    46718  12-27-2024 04:14   responses-0.25.4.dist-info/METADATA
       91  12-27-2024 04:14   responses-0.25.4.dist-info/WHEEL
       10  12-27-2024 04:14   responses-0.25.4.dist-info/top_level.txt
      794  12-27-2024 04:14   responses-0.25.4.dist-info/RECORD
---------                     -------
   125464                     10 files

Note that the source dist still contains:

(venv) sputt@sputt-mbp2 responses % tar tf dist/responses-0.25.4.tar.gz                           
responses-0.25.4/
responses-0.25.4/CHANGES
responses-0.25.4/LICENSE
responses-0.25.4/MANIFEST.in
responses-0.25.4/PKG-INFO
responses-0.25.4/README.rst
responses-0.25.4/pyproject.toml
responses-0.25.4/responses/
responses-0.25.4/responses/__init__.py
responses-0.25.4/responses/_recorder.py
responses-0.25.4/responses/matchers.py
responses-0.25.4/responses/py.typed
responses-0.25.4/responses/registries.py
responses-0.25.4/responses/tests/
responses-0.25.4/responses/tests/__init__.py
responses-0.25.4/responses/tests/test_matchers.py
responses-0.25.4/responses/tests/test_multithreading.py
responses-0.25.4/responses/tests/test_recorder.py
responses-0.25.4/responses/tests/test_registries.py
responses-0.25.4/responses/tests/test_responses.py
responses-0.25.4/responses.egg-info/
responses-0.25.4/responses.egg-info/PKG-INFO
responses-0.25.4/responses.egg-info/SOURCES.txt
responses-0.25.4/responses.egg-info/dependency_links.txt
responses-0.25.4/responses.egg-info/not-zip-safe
responses-0.25.4/responses.egg-info/requires.txt
responses-0.25.4/responses.egg-info/top_level.txt
responses-0.25.4/setup.cfg
responses-0.25.4/setup.py
responses-0.25.4/tox.ini