fix: add socket error and metrics

[arun3528]

Small PR to add error metrics for socket

by making the following changes

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[adhmenon]

Changes LGTM.
Just 1-2 minor comments

[adhmenon]

Just an open question - should we track mercury metrics along with the other regular websocket metric events?
Or should we have a separate metric for this?

[arun3528]

i thought this is specifc to the contact center socket and has nothing to do with mercury, calling one is different not sure how they would work here