feat(indexmap): Add support for changing HashMaps to IndexMaps.

[JosiahBull]

Feature

This MR closes #555, and implements support for generating using IndexMap instead of HashMap as a global setting.

TODO

• Support IndexSet instead of HashSet Sets are not yet supported in the wider API.
• Support other types of Map? Any requests while I'm here?

[JosiahBull]

@ahl Would appreciate your input on this before I continue down the TODO list, at least just an affirmation that you're happy with the direction I'm taking this lol.

[ahl]

I added some notes to #555

[JosiahBull]

@ahl I have read and adjusted the PR according to your comments. I believe this is ready for review now.

[ahl]

good progress! I'd love to see some materialized code akin to the test_schemas test, but I don't want to duplicate all of that. If you have any ideas please let me know.

[JosiahBull]

I notice that there are quite a few clippy warning in this repo, would you be open to an MR purely resolving lints + adding a CI job to maintain them going forward?

[JosiahBull]

I'd love to see some materialized code akin to the test_schemas test

Had a go at this, let me know if it is what you are after.

[ahl]

I notice that there are quite a few clippy warning in this repo, would you be open to an MR purely resolving lints + adding a CI job to maintain them going forward?

I don't think that would be helpful at this time.

[ahl]

Thanks for the contribution.