Add as_XXX_ref and as_XXX_ref_mut to Dynamic. #891

Add as_XXX_ref and as_XXX_ref_mut to Dynamic.

Usage Workflow file

7 errors and 16 warnings

`cfg` attributes are not allowed for `export_fn`

cannot find function `test_fn` in this scope

`cfg` attributes are not allowed for `export_fn`

cannot find function `test_fn` in this scope

failed to resolve: could not find `test_mod` in `test_module`

The process '/home/runner/.cargo/bin/cargo' failed with exit code 101

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/

unexpected `cfg` condition name: `no_std`

unexpected `cfg` condition name: `no_std`

unexpected `cfg` condition name: `no_std`

unexpected `cfg` condition name: `no_std`

`rhai_codegen` (lib) generated 4 warnings

unexpected `cfg` condition value: `no_float`