Add docs for blossom, add nip 86 and 98 support

docs/util/nip86.md

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+# NIP-86 Relay Management
+
+Implementation of NIP-86 for managing Nostr relays through authenticated RPC requests.
+
+## Types
+
+```typescript
+export enum ManagementMethod {
+  SupportedMethods = "supportedmethods",
+  BanPubkey = "banpubkey",
+  AllowPubkey = "allowpubkey",
+  ListBannedPubkeys = "listbannedpubkeys",
+  ListAllowedPubkeys = "listallowedpubkeys",
+  ListEventsNeedingModeration = "listeventsneedingmoderation",
+  AllowEvent = "allowevent",
+  BanEvent = "banevent",
+  ListBannedEvents = "listbannedevents",
+  ChangeRelayName = "changerelayname",
+  ChangeRelayDescription = "changerelaydescription",
+  ChangeRelayIcon = "changerelayicon",
+  AllowKind = "allowkind",
+  DisallowKind = "disallowkind",
+  ListAllowedKinds = "listallowedkinds",
+  BlockIp = "blockip",
+  UnblockIp = "unblockip",
+  ListBlockedIps = "listblockedips",
+}
+
+export type ManagementRequest = {
+  method: ManagementMethod
+  params: string[]
+}
+```
+
+## Functions
+
+```typescript
+// Sends a management request to a relay
+export declare const sendManagementRequest: (url: string, request: ManagementRequest, authEvent: SignedEvent) => Promise<any>
+```
+
+## Example
+
+```typescript
+import { sendManagementRequest, ManagementMethod, makeHttpAuth } from '@welshman/util'
+
+// Set up our url and params
+const url = "https://relay.example.com/"
+const payload = {method: ManagementMethod.SupportedMethods, params: []}
+
+// Create auth event for the management endpoint
+const authEvent = await makeHttpAuth(url, "POST", JSON.stringify(payload))
+const signedAuthEvent = await signer.signEvent(authEvent)
+
+// Get a list of supported methods
+const response = await sendManagementRequest(url, payload, signedAuthEvent)
+```