Add support OctoAI LLM and embeddings

[ptorru]

Problem

Currently there is no way to invoke OctoAI endpoints

Solution

Add OctoAI adaptors based on those from Anyscale. Updated README for env vars.

Type of Change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [X] This change requires a documentation update
• [ ] Infrastructure change (CI configs, etc)
• [ ] Non-code change (docs, etc)
• [ ] None of the above: (explain here)

Test Plan

Added unit-test for record-encoder. Can be checked via:

poetry run pytest tests/system/record_encoder/test_octoai_record_encoder.py

Done manual e-2-e test using canopy server/chat.

Use the following .env

PINECONE_API_KEY="..."
OCTOAI_API_KEY="..."
INDEX_NAME="octo"
CANOPY_CONFIG_FILE="src/canopy/config_templates/octoai.yaml"
OPENAI_API_KEY="..."

Then:

poetry run canopy new
poetry run canopy upsert doc.txt
poetry run canopy start

In a separate terminal:

poetry run canopy chat --no-stream