[Bug] Invalid input values causes rust panic

[0rphon]

🐛 Bug Report

found while testing out #1040. this is correct to fail, but should be caught by leo instead of rust

Code snippet to reproduce

[main]
a: u8 = -2;

function main(a: u8) {}

Stack trace & error message

D:\Work\leo-playground>D:\Work\leo_repos\leo\target\release\leo clean && D:\Work\leo_repos\leo\target\release\leo run
      Done Finished in 0 milliseconds 

     Build Starting...
     Build Compiling main program... ("D:\\Work\\leo-playground\\src/main.leo")
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error(FormattedError { line_start: 1, line_stop: 1, col_start: 1, col_stop: 24, path: "D:\\Work\\leo-playground\\src/main.leo", content: "function main(a: u8) {}\r", message: "failed to parse `-2` as expected integer type" })', D:\Work\leo_repos\leo\compiler\src\value\integer\integer.rs:136:32
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Your Environment

• leo commit 20befbd
• rustc version 1.55.0-nightly
• windows 10 build 10.0.19041.630