[Frontend design] Federation experience - View Federation Relationships

[mamy-CS]

Implement a view of list of federated servers:

• A new route/ page at the top navbar for Federation (See Image below)
• A sub link that shows Federation Relationships and another sublink to create a Federation Relationship
• This issue focuses on the first sub link, which is viewing the already-created Federation Relationships
• Use backend apis bundle show/list and federation list (See [here])(

  tornjak/api/agent/server.go

  Lines 982 to 990 in 82214ac

  	apiRtr.HandleFunc("/api/v1/spire/bundle", s.bundleGet).Methods(http.MethodGet, http.MethodOptions)
  	apiRtr.HandleFunc("/api/v1/spire/federations/bundles", s.federatedBundleList).Methods(http.MethodGet, http.MethodOptions)
  	apiRtr.HandleFunc("/api/v1/spire/federations/bundles", s.federatedBundleCreate).Methods(http.MethodPost)
  	apiRtr.HandleFunc("/api/v1/spire/federations/bundles", s.federatedBundleUpdate).Methods(http.MethodPatch)
  	apiRtr.HandleFunc("/api/v1/spire/federations/bundles", s.federatedBundleDelete).Methods(http.MethodDelete)
  	apiRtr.HandleFunc("/api/v1/spire/federations", s.federationList).Methods(http.MethodGet, http.MethodOptions)
  	apiRtr.HandleFunc("/api/v1/spire/federations", s.federationCreate).Methods(http.MethodPost)
  	apiRtr.HandleFunc("/api/v1/spire/federations", s.federationUpdate).Methods(http.MethodPatch)
  	apiRtr.HandleFunc("/api/v1/spire/federations", s.federationDelete).Methods(http.MethodDelete)

  )

Helpful documents:
ppt on federation - https://ibm.enterprise.slack.com/files/WAJG4N7SP/F07NTKS7Y4F/24-06-06-spiffe.pptx
Documentation on creating federation using Tornjak based apis - https://github.com/maia-iyer/spire-demos/blob/main/tornjak_api_federation/README.md

Example code on how the agent, entry and cluster apis are deigned in the frontend

[mamy-CS]

/assign @sestuna117