feat(extensions): add LogInfosFromContext helper (#133)

[lerenn]

Issue

Addresses #133 — the controller stores contextual information (channel, correlation ID, direction, …) in the context.Context, and the built-in loggers unwrap it. A custom logger had to know and unwrap each context key itself, which the issue calls out as tedious.

Change

Adds extensions.LogInfosFromContext(ctx) []LogInfo, which extracts all the asyncapi-codegen context values (provider, channel, direction, correlation ID, broker message, version) that are set into a []LogInfo in a single call. A custom logger can simply append them:

func (l MyLogger) Info(ctx context.Context, msg string, info ...extensions.LogInfo) {
    info = append(info, extensions.LogInfosFromContext(ctx)...)
    // ...
}

This is non-breaking and additive. The full refactor proposed in the issue (passing everything as explicit arguments from the generated code and dropping context enrichment from the built-in loggers) is a breaking, repo-wide change and is intentionally left out of this PR — hence "Addresses" rather than "Fixes".

Test

pkg/extensions/logger_test.go asserts the helper returns a LogInfo for each value present (and only those), and nothing for an empty context. It fails to compile before the change (function undefined) and passes after.

🤖 Generated with Claude Code