Add Garak tool

[marcorosa]

This PR adds garak as a tool that can be run from STARS.
Not all Garak's probes are supported by STARS, as many of them fall outside our working scenario. Thus, only the ones related to prompt injection, jailbreak, system prompt leak and insecure code generation have been integrated.
This is to say, the following:

• dan
• encoding
• goodside
• latentinjection
• malwaregen
• phrasing
• promptinject
• suffix

Still TODOs:

• Wait for garak new release in pypi
• add garak in our requirements (requires patch Fix ambiguous series value error when running --report NVIDIA/garak#1171 to be released)
• fix conflicting dependencies
  • pyrit Update PyRIT to v0.9.x #23
  • langchain v3 Update agent using langchain v3 #45
• respect AttackResult format (see Caroline's)
• call save to db

[marcorosa]

Double check attack score as computed here before merging the PR

[marcorosa]

Langchain upgrade do v3 work in progress in a dedicated branch. To be merged here.

[marcorosa]

langchain v3 is supported (and the corresponding branch might be merged into this one), but #23 is needed, too (introducing other conflicts).

[marcorosa]

pyrit update wip in #52

[marcorosa]

MERGE AFTER #46

[marcorosa]

Fix conflicts and garak attacks' return json format

[marcorosa]

TODO BEFORE MERGE:

• make AttackResult return class consistent to other attacks (see Caroline's work)
• save results to db