ISSUE-4540: Pulsar Client has no support in Mac 10.14.5 (18F132) ?

[sijie]

Original Issue: apache#4540

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Describe the bug
Python Pulsar Client say import _pulsar ImportError Reason: image not found

To Reproduce
Steps to reproduce the behavior:
In Mac: pip install pulsar-client --upgrade

python consumer.py

Traceback (most recent call last):
  File "consumer.py", line 1, in <module>
    import pulsar
  File "/Users/chethan/anaconda3/lib/python3.7/site-packages/pulsar/__init__.py", line 99, in <module>
    import _pulsar
ImportError: dlopen(/Users/chethan/anaconda3/lib/python3.7/site-packages/_pulsar.cpython-37m-darwin.so, 2): Library not loaded: /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/Python
  Referenced from: /Users/chethan/anaconda3/lib/python3.7/site-packages/_pulsar.cpython-37m-darwin.so
  Reason: image not found

Desktop (please complete the following information):

• OS: Mac 10.14.5 (18F132)

Additional context
Tried in both normal env and Conda env: 3.7, 2.7

Whats the possible solution?

Also, In official docs: pip install pulsar-client==2.3.2
But, I got error while installing:
Collecting pulsar-client==2.3.2

  ERROR: Could not find a version that satisfies the requirement pulsar-client==2.3.2 (from versions: 1.18.dev1, 1.19.dev1, 1.19.dev2, 1.19.0, 1.20.0, 1.21.0, 1.22.0, 2.0.1, 2.1.0, 2.1.1, 2.2.0, 2.2.1, 2.3.0, 2.3.0.post1, 2.3.1)
ERROR: No matching distribution found for pulsar-client==2.3.2

Thanks!.