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## Description This introduces a `Command::parse` constructor that emulates the behaviour of the `clap` parse constructor in order to provide a more consistent clap-like CLI experience. For context, we cannot use the generated `parse` command due to limitations in clap's ability to handle trailing subcommands as mentioned in #3804. We switch to using `thiserror` in the library in order to allow for handling error cases (necessary for the new `parse` constructor) and to provide cleaner, more detailed error cause traces. The help and version output no longer panic, and now behave like regular clap applications. Closes #3886. Also adds an example command invocation to the end of the `--help` output. ## Checklist - [x] I have linked to any relevant issues. - [x] I have commented my code, particularly in hard-to-understand areas. - [x] I have updated the documentation where relevant (API docs, the reference, and the Sway book). - [ ] I have added tests that prove my fix is effective or that my feature works. - [x] I have added (or requested a maintainer to add) the necessary `Breaking*` or `New Feature` labels where relevant. - [x] I have done my best to ensure that my PR adheres to [the Fuel Labs Code Review Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md). - [x] I have requested a review from the relevant team or maintainers. |
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