Adds support for imports in code generation · amazon-ion/ion-cli@e574f83

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/

unused import: `ion_schema::isl::isl_import::IslImport`

variable does not need to be mutable

unused variable: `schema_system`

method `generate_code_for_import_type` is never used

`ion-cli` (bin "ion") generated 4 warnings (run `cargo fix --bin "ion"` to apply 2 suggestions)

unused import: `ion_schema::isl::isl_import::IslImport`

variable does not need to be mutable

unused variable: `schema_system`

method `generate_code_for_import_type` is never used

`ion-cli` (bin "ion" test) generated 4 warnings (4 duplicates)

unused import: `IonResult`

unused import: `struct_with_enum_fields::StructWithEnumFields`

unused import: `e::E`

unused import: `enum_type::EnumType`

unused import: `c::C`

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/

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