[kb] Removed index_params from __init__()

[igiloh-pinecone]

Problem

It doesn't make too much sense to require the index_params argument in the constructor. In interactive usage - this param should be passed directly to the create_resin_index()

Solution

method. I had to complicate the code of from_config() a bit - but it makes the usage pattern of KnowledgeBase much more explicit and readable.

Type of Change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Test Plan

Currently not covered. Will add test case separately.