[ShopifyVM] Minify input json

[mssalemi]

Addresses: https://github.com/Shopify/shopify-functions/issues/394

This PR introduces a new function, minify_json, aimed at standardizing the handling of JSON data across our system's backend and Function Runner components. The primary goal is to ensure that JSON data is consistently processed in its minified form, promoting efficiency and reducing discrepancies in data handling practices between different environments.

Background:

Currently, there is an inconsistency in how JSON data is managed between our backend and the function-runner. The backend measures the size of JSON strings using .bytesize on minified strings. Function runner has been handling JSON data without explicit minifying the input, potentially leading to larger data sizes - could lead to issues with difference of partner machines

Changes:

add a minify_json Function: This function takes a byte slice as input and performs the following operations:

• Deserialize: Converts the byte slice into a serde_json::Value to validate the JSON structure.
• Serialization: serde_json::Value -> back into a byte vector (minifying the JSON)
• Deserialization: Converts the minified byte vector back into a serde_json::Value
• Integration in Function Runner: The minify_json function get called when we are reading the input.

^ might be a better way to do this 🤔

Next Steps:

• 👀

[jacobsteves]

Closing as this was implemented in another PR.