feat(rome_cli): print number of errors in summary

[SuperchupuDev]

Summary

Prints the number of errors emitted on the check summary, or at least tries to. I'm not really experienced in Rust so it's very possible this breaks something / doesn't work as intended, but it does its job, I guess. Feel free to supersede or suggest changes if you have a better approach

Closes #3588

Test Plan

Commands ran:

cargo build
cargo run --bin rome check ./my-cool-ts-project

where my-cool-ts-project is a directory with a TypeScript file

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[SuperchupuDev]

somehow the snapshot tests are failing after updating them, any idea how i can fix it?

[ematipico]

somehow the snapshot tests are failing after updating them, any idea how i can fix it?

We use insta. You have to install it via cargo: cargo install cargo-insta. Then run cargo insta review or cargo insta accept