Make the HeaderInfo constructor public for mockability in tests

[jadamcrain]

This was referenced in #384

[gemini-code-assist]

Summary of Changes

Hello @jadamcrain, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the testability of the HeaderInfo structure. By exposing its constructor, it becomes significantly easier to create mock HeaderInfo objects within unit tests. This is a crucial step for isolating and testing components that depend on HeaderInfo, ensuring that tests can run independently and reliably without being tied to complex internal construction logic.

Highlights

• HeaderInfo Constructor: The constructor for the HeaderInfo structure has been made public by adding a full initializer. This change directly addresses the need for improved mockability of HeaderInfo in tests.

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[gemini-code-assist]

Code Review

The pull request introduces a change to the read_handler.rs file in the ffi/dnp3-schema directory by adding a full initializer to the header_info struct. This change aims to enhance mockability in tests by making the constructor public.

[gemini-code-assist]

Adding a full initializer to the header_info struct enhances its usability and testability. This is a good change to improve the API.
Consider adding documentation to the initializer to explain its purpose and usage.

Suggested change

	.add_full_initializer("init")?
	.add_full_initializer("init")? // Add a full initializer for easy object construction