Skip unrolling follow up

[simeetnayan81]

Description: Follow up PR for adding argument skip_unrolling in Metric Class. #3258
Following classes need to be updated:

• Accuracy
• AveragePrecision
• CohenKappa
• ConfusionMatrix
• CosineSimilarity
• Entropy (Only docstring update is required)
• EpochMetric
• Frequency (We may skip this)
• JSDivergence (Only docstring update is required)
• KSDivergence (Only docstring update is required)
• MaximumMeanDiscrepancy
• MeanAbsoluteError (Only docstring update is required)
• MeanPairwiseDistance
• MeanSquaredError (Only docstring update is required)
• MultiLabelConfusionMatrix
• MutualInformation (Only docstring update is required)
• PrecisionRecallCurve
• Precision
• PSNR
• Recall
• ROC_AUC
• RootMeanSquaredError (Only docstring update is required)
• RunningAverage
• SSIM
• TopKCategoricalAccuracy

Modification might also be required to related classes.

Check list:

• New tests are added (if a new feature is added)
• New doc strings: description and/or example code are in RST format
• Documentation is updated (if required)

[simeetnayan81]

This is just an initial PR. I am currently working on the remaining classes.

[vfdev-5]

Thanks a lot for the PR with all those meticulous updates!
I left few comments to improve it.

[simeetnayan81]

I don't think these classes require skip_unrolling feature. Lmk.
Frequency, GpuInfo, MetricsLamda

[vfdev-5]

Yes, we can skip GpuInfo and MetricsLambda, but we still need to add it to Frequency for consistency.

[simeetnayan81]

Have updated the Frequency class as well. Args were missing in docstring, added them.

[vfdev-5]

LGTM, thanks a lot for the PR, @simeetnayan81 !
Good to go once the CI is green (as we ignore failing TPU test)