Add typescript library

[grod220]

Meant to be consumed by typescript codebases. Provides a helper class that handles typing + fetching + caching for the registry. Example:

import { ChainRegistryClient } from '@penumbra-labs/regisry';

const client = new ChainRegistryClient()

const { assetById, chainId, rpcs, ibcConfig } = await client.registry("penumbra-testnet-deimos-6")

Likely needs to be expanded in the future with more utility functions. Published to npm as @penumbra-labs/registry.