Implement dashboard frontend [Part1]

[mamy-CS]

Frontend [UI] implementation of https://github.com/lumjjb/tornjak/issues/40

Plan to include following components:

• Banner ["/api/tornjak/clusters/list" + "/api/entry/list"]
  • number agents per cluster
  • number workload entries per agent
  • number workload entries per cluster
• ClusterList ["/api/tornjak/clusters/list" + "/api/entry/list"]
  • Name
  • Created at / Age
  • Number of nodes (based on # agents)
  • Number of WL entries
• AgentList ["/api/agent/list" + "/api/tornjak/agents/list" + "/api/entry/list"]
  • Name / SPIFFEID
  • Agent Status
  • Platform type
  • Cluster name (if assigned)
  • Number of WL entries
• WorkloadEntryList ["/api/entry/list" + "/api/tornjak/agents/list"]
  • SPIFFE ID
  • Parent ID (agent SPIFFEID)
  • Admin Flag
  • Entry expiry time (based on expires-at)
  • Platform type (Kubernetes, Docker or Unix)
  • Cluster name (if agent with Parent ID assigned)