## Summary of the Pull Request
Fixes a bug where top-level iterable commands were not serialized.
## PR Checklist
* [X] Closes#10365
* [X] Tests added/passed
## Detailed Description of the Pull Request / Additional comments
- `Command::ToJson`:
- iterable commands deserve the same treatment as nested commands
- `ActionMap`:
- Similar to how we store nested commands, iterable commands need to be handled separately from standard commands. Then, when generating the name map, we make sure we export the iterable commands at the same time we export the nested commands.
## Summary of the Pull Request
This PR builds on the `ActionMap` PR (#6900) by leveraging `ActionMap` to serialize actions. From the top down, the process is now as follows:
- `CascadiaSettings`: remove the hack of copying whatever we had for actions before.
- `GlobalAppSettings`: serialize the `ActionMap` to `"actions": []`
- `ActionMap`: iterate over the internal `_ActionMap` (list of actions) and serialize each `Command`
- `Command`: **THIS IS WHERE THE MAGIC HAPPENS!** For _each_ key mapping, serialize an action. Only the first one needs to include the name and icon.
- `ActionAndArgs`: Find the relevant `IActionArgs` parser and serialize the `ActionAndArgs`.
- `ActionArgs`: **ANNOYING CHANGE** Serialize any args that are set. We _need_ each setting to be saved as a `std::optional`. As with inheritance, this allows us to distinguish an explicit setting to the default value (sometimes `null`) vs an implicit "give me the default value". This allows us to serialize only the relevant details of each action, rather than writing _all_ of the args.
## References
- #8100: Inheritance/Layering for lists
- This tracks layering and better serialization for color schemes _and_ actions. This PR resolves half of that issue. The next step is to apply the concepts used in this PR (and #9621) to solve the similar problem for color schemes.
- #6900: Actions page
## Validation Steps Performed
Tests added!
This entirely removes `KeyMapping` from the settings model, and builds on the work done in #9543 to consolidate all actions (key bindings and commands) into a unified data structure (`ActionMap`).
## References
#9428 - Spec
#6900 - Actions page
Closes#7441
## Detailed Description of the Pull Request / Additional comments
The important thing here is to remember that we're shifting our philosophy of how to interact/represent actions. Prior to this, the actions arrays in the JSON would be deserialized twice: once for key bindings, and again for commands. By thinking of every entry in the relevant JSON as a `Command`, we can remove a lot of the context switching between working with a key binding vs a command palette item.
#9543 allows us to make that shift. Given the work in that PR, we can now deserialize all of the relevant information from each JSON action item. This allows us to simplify `ActionMap::FromJson` to simply iterate over each JSON action item, deserialize it, and add it to our `ActionMap`.
Internally, our `ActionMap` operates as discussed in #9428 by maintaining a `_KeyMap` that points to an action ID, and using that action ID to retrieve the `Command` from the `_ActionMap`. Adding actions to the `ActionMap` automatically accounts for name/key-chord collisions. A `NameMap` can be constructed when requested; this is for the Command Palette.
Querying the `ActionMap` is fairly straightforward. Helper functions were needed to be able to distinguish an explicit unbinding vs the command not being found in the current layer. Internally, we store explicitly unbound names/key-chords as `ShortcutAction::Invalid` commands. However, we return `nullptr` when a query points to an unbound command. This is done to hide this complexity away from any caller.
The command palette still needs special handling for nested and iterable commands. Thankfully, the expansion of iterable commands is performed on an `IMapView`, so we can just expose `NameMap` as a consolidation of `ActionMap`'s `NameMap` with its parents. The same can be said for exposing key chords in nested commands.
## Validation Steps Performed
All local tests pass.
