feat: update grafana dashboard

[vprashar2929]

This PR updates the Grafana dashboard by:

• Adds panel that shows a list of CPU architecture and the corresponding count of nodes.
• Adds panel that shows the Total number of Kepler exporter pods. This will correspond to a number of nodes where the Kepler exporter daemon set is deployed.
• Adds a tooltip to each panel that links to Kepler-doc's that contains a brief description of each and every metric used.
• Adds panel that shows total energy consumption by source. (Using kepler_node_platform_joules_total)
• Separate out Pod/Process Power Consumption (W) in Namespace to different panels wrt PKG/DRAM/OTHER/GPU.
• Update existing panels(i.e. Total Power Consumption (PKG+DRAM) for Top 10 Namespaces, Power Consumption (W) of Top10 processes in Namespace: $namespace, Total Power Consumption (kWh per day) of Top10 processes in Namespace: $namespace)

Dashboard Screenshot:

[sthaha]

This is worth submitting to kepler repo, if you haven't already, @vprashar2929. Good job!!

[sthaha]

@vprashar2929 shall we close this one?

[sthaha]

Please feel free to open a new PR