Fix missing readline error on Windows

[jhamon]

Problem

Missing readline dependency error when using list_models function. Reported in #502

Solution

This error was the result of the Cursor assistant putting some code into pinecone/scripts/repl.py that should only have gone into scripts/repl.py (and not been part of the package distribution).

This wasn't caught in CI because:

• readline is included in our dev dependencies, which are installed in CI for testing purposes. readline is part of the python standard library, so even though this reference was inadvertantly referenced, the presence of these import statements should not cause a problem on dev machines (mac) or CI (linux). However, readline is not available for Windows which is why this error was occurring for the person who reported.
• Currently we do not have any Windows-specific testing in CI which is why this error shipped unnoticed. So I implemented some new tests to check the package can be installed on Windows in this PR.

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Test Plan

• Going to make a dev build and verify list_models() works in google colab (where dev dependencies are not present) (7.0.2.dev1)
• Tested in Colab with 7.0.0 and 7.0.1 and could not reproduce the problem; after further research it turns out this is a windows specific problem. I should probably add some windows builds into the test matrix.
• Added new installation tests workflow to verify Windows install

[rohanshah18]

LGTM!

[austin-denoble]

Do these commented blocks need to come out?

[jhamon]

Yeah, thanks for flagging. I just put them back. I disabled them temporarily to iterate quicker on some installation tests I just added.