The package nostr-dev-kit was using a dependency (tseep) which
downstream would flag as not CSP-safe.
Additionally nostr-tools footprint is much smaller.
Canonical encoding for BigInt (<bigint: Xn>) and Uint8Array (hex or
<Uint8Array: 0x...>) used in the relay protocol. Provides both
serialization (sourceOutputToRelay, transactionToHex) and deserialization
(parseExtendedJson, toUint8Array, toBigInt) so dapps and wallets
don't have to implement this independently.
