Multistage build with baked-in models needed for the enabled guardrails

[m-misiura]

Description

Dockerfile server (Dockerfile.server)

• can be built with two optional profiles ARG GUARDRAILS_PROFILE; when ARG GUARDRAILS_PROFILE is set to "opensource", closed source guardrails as specified in scripts/provider-list.yaml are removed; when ARG GUARDRAILS_PROFILE is set to "all", there is no removal
• there are two additional scripts (scripts/discover_required_models.py and pre_download_required_models.py) which attempt to find which models are being used by the guardrails; then these models are downloaded inside the image

pyproject.toml

• added a section for the optional model deps
• added cpu pytorch as an explicit dependency

Test

Ran this small demo: https://github.com/m-misiura/demos/tree/main/nemo_openshift with the following image: quay.io/rh-ee-mmisiura/nemo-guardrails:os_profile_with_models

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