Add eval requirement to setup.py

[athitten]

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What does this PR do ?

Adds requirements_eval.txt to setup.py to install lm-eval-harness inside NeMo FW containers.

Collection: [Note which collection this PR will affect]

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[thomasdhc]

LGTM

[ko3n1g]

⚠️ We have entered code-freeze. If this PR should be part of the 25.02 framework-release, please attach the label r2.2.0 before merging this PR. ⚠️