Algorithm newtype introduced in createHash for better type safety

[m-rinaldi]

Changed the type of createHash from String -> Effect Hash to Algorithm -> Effect Hash.

---

So far, createHash has accepted a String representing the hash algorithm. This is ambiguous and error-prone — it gives no clue that the string represents the algorithm name, not the input to be hashed. This can easily lead to misuse or confusion, for example:

createHash "hello" -- mistakenly hashing "hello" instead of selecting the algorithm

This example will compile, but crash at runtime with:

Uncaught Error: Digest method not supported

By introducing the Algorithm newtype:

createHash (Algorithm "hello") -- clearly wrong: "hello" is not a valid algorithm

We make incorrect usage visibly suspicious. The newtype acts as a clue, encouraging the user to pause and consider what this string actually represents. It clarifies intent and helps prevent real-world runtime errors.