[NEW] Federation setup (#22208)

app/api/server/index.js

app/api/server/v1/dns.ts

app/federation/server/functions/resolveDNS.ts

client/components/Card/Col.tsx

client/components/Card/ColSection.tsx

client/contexts/ModalContext.ts

client/contexts/ServerContext/endpoints.ts

...nt/contexts/ServerContext/endpoints/v1/dns/resolve.srv.ts

...nt/contexts/ServerContext/endpoints/v1/dns/resolve.txt.ts

client/types/global.d.ts

client/views/admin/info/FederationCard/FederationCard.tsx

...views/admin/info/FederationCard/components/CardHeader.tsx

...derationCard/components/FederationModal/DNSRecordItem.tsx

.../FederationCard/components/FederationModal/DNSRecords.tsx

...nfo/FederationCard/components/FederationModal/DNSText.tsx

...rationCard/components/FederationModal/FederationModal.tsx

...FederationCard/components/FederationModal/InviteUsers.tsx

...n/info/FederationCard/components/FederationModal/Types.ts

...n/info/FederationCard/components/FederationModal/index.ts

...iews/admin/info/FederationCard/components/InviteUsers.tsx