Use lazy loading in error decorator, debugging config

[jhamon]

Problem

We want to continue improving our import and initialization times.

Solution

• Refactor the @validate_and_convert_errors decorator to use lazy-loading of urllib3. We only need to load urllib3 in this decorator at the moment an exception has occurred.
• Refactor pinecone.config.openapi_configuration.py to avoid loading the http module unless enabling debug logging. The default http log level is already 0 (disabled) so there's no need to set it in the default case.

Perf testing

poetry run python3 -X importtime -c "from pinecone import Pinecone; pc = Pinecone(api_key='foo')" 2> main.log

Comparing the importtime results before and after this change shows a reduction from 101ms to 65ms, a savings of 36ms which is about 36%.