docs(examples): add NemoGuard colang 2.0 example configs

[Pouyanpi]

Description

Add colang 2.0 example config for NemoGuards

Note:

topic control currently has a bug, it is fixed in #1335

[github-actions]

Documentation preview

https://nvidia.github.io/NeMo-Guardrails/review/pr-1289

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.04%. Comparing base (57a3abc) to head (d449dc9).
⚠️ Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1289      +/-   ##
===========================================
+ Coverage    71.02%   71.04%   +0.01%     
===========================================
  Files          162      162              
  Lines        16389    16398       +9     
===========================================
+ Hits         11641    11650       +9     
  Misses        4748     4748              

Flag	Coverage Δ
python	71.04% <ø> (+0.01%)	⬆️

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[Pouyanpi]

requires #1335

[Pouyanpi]

@miyoungc there was request to add content safety examples with Colang 2.0 in documentation. It should be part of https://docs.nvidia.com/nemo/guardrails/latest/colang-2/ for now.

[cparisien]

I think this needs attention from Miyoung. Depending on her input it might be cleaner to make specific changes here, then merge and let Miyoung add her own PR.

[tgasser-nv]

Looks good! One small nit: Could you rename the directory from nemoguards_v2 to nemoguard_colang2 or something similar? It sounds like these configs are for V2 of the nemoguard models and not Colang 2.