Add as_XXX_ref and as_XXX_ref_mut to Dynamic. #892

Add as_XXX_ref and as_XXX_ref_mut to Dynamic.

Usage Workflow file

13 warnings

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 uses Node.js version which is deprecated 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 imports: `Dynamic` and `Position`

unused import: `std::convert::TryInto`

`rhai` (test "maps") generated 2 warnings (run `cargo fix --test "maps"` to apply 2 suggestions)

`rhai` (test "parse_json") generated 1 warning (run `cargo fix --test "parse_json"` to apply 1 suggestion)

unused import: `convert::TryInto`

`rhai` (test "arrays") generated 2 warnings (run `cargo fix --test "arrays"` to apply 2 suggestions)

`rhai` (test "custom_syntax") generated 1 warning (run `cargo fix --test "custom_syntax"` to apply 1 suggestion)

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/