Add pyproject.toml with pybind11 to fix a dependency issue.

[thsunkid]

Adding pyproject.toml helps fix the below issue when building fastText from pip.

Collecting fasttext (from -r requirements.txt (line 10))
  Downloading fasttext-0.9.2.tar.gz (68 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 68.8/68.8 kB 15.5 MB/s eta 0:00:00
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'error'
  error: subprocess-exited-with-error
  
  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [25 lines of output]
      /opt/hostedtoolcache/Python/3.9.12/x64/bin/python: No module named pip
      Traceback (most recent call last):
        File "<string>", line 38, in __init__
      ModuleNotFoundError: No module named 'pybind11'
      
      During handling of the above exception, another exception occurred:
      
      Traceback (most recent call last):
        File "/opt/hostedtoolcache/Python/3.9.12/x64/lib/python3.9/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 3[53](https://github.com/Su-Sea/ml/actions/runs/4734674262/jobs/8403919877?pr=148#step:6:54), in <module>
          main()
        File "/opt/hostedtoolcache/Python/3.9.12/x[64](https://github.com/Su-Sea/ml/actions/runs/4734674262/jobs/8403919877?pr=148#step:6:65)/lib/python3.9/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
          json_out['return_val'] = hook(**hook_input['kwargs'])
        File "/opt/hostedtoolcache/Python/3.9.12/x64/lib/python3.9/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
          return hook(config_settings)
        File "/tmp/pip-build-env-jmomr3il/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 338, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=['wheel'])
        File "/tmp/pip-build-env-jmomr3il/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 320, in _get_build_requires
          self.run_setup()
        File "/tmp/pip-build-env-jmomr3il/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 484, in run_setup
          super(_BuildMetaLegacyBackend,
        File "/tmp/pip-build-env-jmomr3il/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 335, in run_setup
          exec(code, locals())
        File "<string>", line [72](https://github.com/Su-Sea/ml/actions/runs/4734674262/jobs/8403919877?pr=148#step:6:73), in <module>
        File "<string>", line 41, in __init__
      RuntimeError: pybind11 install failed.
      [end of output]

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[thsunkid]

Hi @dmitryvinn ! Could you take a look?

[thunn]

This patch resolved the same issue for me. Thanks @thsunkid