Function discoverEncryptionKeyFromMessages

discoverEncryptionKeyFromMessages(
    indexer: IndexerClient,
    address: string,
    isChatMessage: (note: Uint8Array) => boolean,
    decodeEnvelope: (note: Uint8Array) => { senderPublicKey: Uint8Array },
    searchDepth?: number,
): Promise<DiscoveredKey | undefined>
Discover encryption key from a chat message transaction.

This extracts the sender's public key from the envelope header of any AlgoChat message they've sent.
Parameters
- indexer: IndexerClient
  The indexer client to use
- address: string
  The Algorand address to find the key for
- isChatMessage: (note: Uint8Array) => boolean
  Function to check if a note is an AlgoChat message
- decodeEnvelope: (note: Uint8Array) => { senderPublicKey: Uint8Array }
  Function to decode envelope and extract public key
- searchDepth: number = 200
  Maximum transactions to search (default: 200)
Returns Promise<DiscoveredKey | undefined>
DiscoveredKey if found, undefined otherwise
- Defined in src/blockchain/discovery.ts:108