feat(types): introduce type files for projects using TS

[IanKrieger]

Adds typings into the base directory, so that a TS project can understand what it is importing

Generates index.d.ts:

export const DEFAULT_SEED_SIZE: number;
export function hmac(message: Uint8Array, key: Uint8Array): Uint8Array;
export function getHKDF(ikm: Uint8Array, info: Uint8Array, extractLen: number, salt?: Uint8Array | undefined): Uint8Array;
export function getSeed(size?: number | undefined): Uint8Array;
export function deriveSigningKeysFromSeed(seed: Uint8Array, salt?: Uint8Array | undefined): {
    secretKey: Uint8Array;
    publicKey: Uint8Array;
};
export function uint8ToHex(arr: Uint8Array | Buffer): string;
export function hexToUint8(hex?: string | undefined): Uint8Array;
export namespace passphrase {
    function fromBytesOrHex(bytes: Uint8Array | Buffer | string, useNiceware?: boolean | undefined): string;
    function toBytes32(passphrase: string): Uint8Array;
    function toHex32(passphrase: string): string;
    let NICEWARE_32_BYTE_WORD_COUNT: number;
    let BIP39_32_BYTE_WORD_COUNT: number;
}
export namespace random {
    function uniform(n: number): number;
    function uniform_01(): number;
}

[diracdeltas]

let me know if you want me to do an npm release for this

[IanKrieger]

@diracdeltas that would be great! I have one more contribution I want to make here, so I think I'll have a 0.4.1 follow after this. It can hold off if need be, but if it's easy then please do!

[diracdeltas]

ok i'll wait til the next version then