Add disable ssl verification to client instantiation

[dudanogueira]

Initial work.
Still need to figure:

• a way to pass disable_ssl_verification to aopen in __batch_send method of _BatchBase class.
• Write some tests or at least check if the httpx client was initiated with the correct verify parameter

The idea is to print this message on exception with CERTIFICATE_VERIFY_FAILED

        We have identified a SSL CERTIFICATE_VERIFY_FAILED error.

        This error could be due to one of several reasons:
        - Weaviate client is under a corporate network that terminates ssl and issues it's own certificates.
        - You have a self signed certificate

        Weaviate python client uses certifi, and because of that, it will not be able to trust
        Potential fixes:
        - disable ssl verification by setting using `disable_ssl_verification=True` in client initialization
            - note that Weaviate will trust any certificate
        - Replace certifi cacert with the same cacert that is issued by your corporate network.
            - for example: cat MyCompanyRootCA.pem >> $(python -m certifi)

To test this, you can rename the cacert.pem inside certifi package, like so:

import certifi
right_path = certifi.where()
wrong_path = right_path + "renamed"

import os 
os.rename(right_path, wrong_path)

[dirkkul]

Closing in favour of #1262