feat: smb2 dashboard

[rahulguptajss]

Fixes #1696

[cgrinds]

These changes look good, few general comments:

• Not immediately clear these should be enabled by default. Let's discuss in our meeting
• The panels probably need an SVM or cluster prefix for when multiples are selected in top vars
• We need to ask for these to be added to rest perf too

[rahulguptajss]

These changes look good, few general comments:

• Not immediately clear these should be enabled by default. Let's discuss in our meeting
• The panels probably need an SVM or cluster prefix for when multiples are selected in top vars
• We need to ask for these to be added to rest perf too

We don't need top vars or SVM/cluster prefix in this dashboard. All the metrics used in dashboard are aggregation like sum,avg.