chore: Cleanup error handling, visibility · fussybeaver/roctogen@63b4afd

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified

`roctogen` (lib test) generated 1 warning (1 duplicate)

unused imports: `activity`, `gists`, `issues`, `licenses`, `meta`, `rate_limit`, `reactions`, `repos`, `search`, `self`, and `users`

unused import: `roctogen::adapters::client`

unused import: `roctogen::auth::Auth`

unused import: `roctogen::models`

unused imports: `debug` and `info`

`roctogen` (test "sync") generated 5 warnings (run `cargo fix --test "sync"` to apply 5 suggestions)

unused variable: `request`

use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified

`roctogen` (lib test) generated 2 warnings (2 duplicates)

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