Migrate indexed module into new indexical crate #288

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1 error and 20 warnings

no such command: `flowistry`

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, 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/

tool `rust-analyzer` is already installed, remove it from `/home/runner/.cargo/bin`, then run `rustup update` to have rustup manage this tool.

tool `cargo-fmt` is already installed, remove it from `/home/runner/.cargo/bin`, then run `rustup update` to have rustup manage this tool.

unused variable: `z`

variable does not need to be mutable

variable `x` is assigned to, but never used

value assigned to `x` is never read

function `basic_constant_and_variable` is never used

function `variable_read` is never used

function `basic_reassign` is never used

path statement with no effect