leo error reporting after build

[ungaro]

Motivation

When developing complex Leo programs, it's not uncommon to encounter multiple compilation errors. This feature, inspired by Rust's error reporting system, provides developers with a clear overview of the number of errors and warnings in their code. Having a precise count of issues serves as a motivational tool, allowing developers to track their progress as they address and resolve bugs. The satisfaction of seeing the error count decrease provides positive reinforcement throughout the debugging process, ultimately enhancing the overall development experience and potentially improving code quality.

Test Plan

Run a leo program that generates errors and warnings.

Here is an example of what it looks like:

[ungaro]

would love to have your review @d0cd

[d0cd]

Closing due to inactivity, feel free to re-open if work resumes!