[native] Add utils to encrypt/decrypt base64 string
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Description

[native] Add utils to encrypt/decrypt base64 string

Summary:
Thumbhash (base64-encoded) is going to be encrypted, so we need to add utils to encrypt/decrypt base64 string.

These functions unwrap the base64-encoded, encrypt/decrypt it and then again base64-encode the result.

Depends on D7760

Test Plan:

const data = new Uint8Array([1,2,3,4,5]);
const b64 = commUtilsModule.base64EncodeBuffer(data.buffer);
const { base64: encryptedB64, keyHex } = encryptBase64(b64);
const decrypted = decryptBase64(encryptedB64, keyHex);
const unwrapped = commUtilsModule.base64DecodeBuffer(decrypted);
console.log(unwrapped);