Proposal: Serialize associative arrays as objects instead of arrays

[jonmldr]

Currently, associative arrays are serialized as arrays in the payload. I'd like to propose changing this behavior to serialize them as objects instead.

Motivation

In many other languages and specifications (like Swagger and JSON schema), associative arrays naturally translate to (unstructured) objects. This approach would also give us a clear distinction between maps (associative arrays) and lists (sequential arrays), making the serialized data more semantically correct.

Other benefits

This change would eliminate the need to recursively iterate through the payload to cast associative arrays to objects when validating the serialized payload against a JSON schema, which can be quite heavy performance-wise.

The change would make EventSauce's serialization more aligned with widely-used standards while also making it suitable for downstream validation.

I'd love to hear your thoughts on this, @frankdejonge 🙌

[jonmldr]

Corresponding PR: #87