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Use pip instead of the deprecated easy_install

See original GitHub issue

Instead of python setup.py develop as indicated in https://github.com/open-mmlab/OpenPCDet/blob/master/docs/INSTALL.md#install-pcdet-v05 users should be instructed to use

python3 -m pip install --user -e .

Otherwise, the users receive an error:

/<home>/.local/lib/python3.8/site-packages/setuptools/command/easy_install.py:157: EasyInstallDeprecationWarning: easy_install command is deprecated. Use build and pip and other standards-based tools.

Additionally, even when running pip install -e (which is equivalent to python setup.py develop, I am getting the following error (in either case):

Installing collected packages: pcdet
  Running setup.py develop for pcdet
    error: subprocess-exited-with-error
    
    × python setup.py develop did not run successfully.
    │ exit code: 1
    ╰─> [29 lines of output]
        running develop
        /home/ma/.local/lib/python3.8/site-packages/setuptools/command/easy_install.py:157: EasyInstallDeprecationWarning: easy_install command is deprecated. Use build and pip and other standards-based tools.
          warnings.warn(
        Traceback (most recent call last):
          File "<string>", line 2, in <module>
          File "<pip-setuptools-caller>", line 34, in <module>
          File "/home/ma/pcdet-object-detection-ros-docker/pcdet-object-detection-ros/OpenPCDet/setup.py", line 34, in <module>
            setup(
          File "/home/ma/.local/lib/python3.8/site-packages/setuptools/__init__.py", line 155, in setup
            return distutils.core.setup(**attrs)
          File "/home/ma/.local/lib/python3.8/site-packages/setuptools/_distutils/core.py", line 148, in setup
            return run_commands(dist)
          File "/home/ma/.local/lib/python3.8/site-packages/setuptools/_distutils/core.py", line 163, in run_commands
            dist.run_commands()
          File "/home/ma/.local/lib/python3.8/site-packages/setuptools/_distutils/dist.py", line 967, in run_commands
            self.run_command(cmd)
          File "/home/ma/.local/lib/python3.8/site-packages/setuptools/_distutils/dist.py", line 985, in run_command
            cmd_obj.ensure_finalized()
          File "/home/ma/.local/lib/python3.8/site-packages/setuptools/_distutils/cmd.py", line 107, in ensure_finalized
            self.finalize_options()
          File "/home/ma/.local/lib/python3.8/site-packages/setuptools/command/develop.py", line 52, in finalize_options
            easy_install.finalize_options(self)
          File "/home/ma/.local/lib/python3.8/site-packages/setuptools/command/easy_install.py", line 276, in finalize_options
            self._fix_install_dir_for_user_site()
          File "/home/ma/.local/lib/python3.8/site-packages/setuptools/command/easy_install.py", line 382, in _fix_install_dir_for_user_site
            self.create_home_path()
          File "/home/ma/.local/lib/python3.8/site-packages/setuptools/command/easy_install.py", line 1338, in create_home_path
            if path.startswith(home) and not os.path.isdir(path):
        AttributeError: 'int' object has no attribute 'startswith'
        [end of output]

I was not able to find a fix for this problem.