Add default dashboards

[everettraven]

Currently a user has to manually create a dashboard config to even use buoy. To provide a lower barrier to entry buoy should provide some default dashboards that can be loaded easily. At a high-level this could look something like buoy --dash=<built-in dashboard config>

The built in dashboards could be something along the lines of:

• Workloads (pods, deployments, etc.)
• Services (services, ingresses, etc.)
• Configuration and Storage (configmaps, secrets, etc.)
• Cluster (ClusterRoles, Roles, PVCs, etc.)
• Custom Resources (CRDs)