Support the evaluation of target function

[nick863]

Description

Evaluate call accepts target parameter. This parameter is callable, which accepts parameters, named the same as columns in the data set and returns dictionary to augment the data or to provide the target value. In this PR we are enabling this functionality. See work item 2932191.

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Testing Guidelines

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[github-actions]

promptflow-evals test result

 12 files   12 suites   6m 31s ⏱️
 36 tests  36 ✅ 0 💤 0 ❌
432 runs  432 ✅ 0 💤 0 ❌

Results for commit eab6a9d.

♻️ This comment has been updated with latest results.