New Metrics (Classification)

[iamharsha1999]

I was specifically looking for the following two metrics:

1. Sensitivity at Specificity
2. Specificity at Sensitivity

However I was not able to find it ? Would it be possible to add these implementations to torchmetrics.

You can find the tensorflow implementations below:
https://www.tensorflow.org/api_docs/python/tf/keras/metrics/SpecificityAtSensitivity
https://www.tensorflow.org/api_docs/python/tf/keras/metrics/SensitivityAtSpecificity

I was thinking, if I should maybe create an issue with respect to this.