feat: adds various secrets functions to encrypt, decrypt and load secrets into process and import.meta

[JacobNWolf]

Description

Adds several new functions to handle the encrypting, decrypting, and loading of secrets into the both Node's process.env and Vite's import.meta.env, including:

• encrypt — which takes and encrypts stringified secrets into a secure format
• decrypt — which takes the encrypted version of those secrets and returns them back
• mergeSecrets — which simply merges the secrets from the existing process.env or import.meta.env with the payload
• loadSecrets — performs all of the above and loads them all

Also adds test runner CI using Vitest and updates JavaScript CI to correctly run Biome.