Migrate to annotate-snippets

[epage]

annotate-snippets is a library version of rustc's diagnostic report renderer.

By migrating cargo to use it,

• we make them more consistent
• we have more features (coloring trailing notes/help, snippet rendering, etc)
• prepare for moving some of our diagnostics to be lints

Tasks

• fix(cli): Adjust messages to match rustc  #15928
• Clean up multi-line Shell::notes
  • fix(publish): Switch the 'ctrl-c on wait' line to a help message #15942
  • fix(future): Report all content as a single Report #15943
• Migrate Shell::note to use print_report (WIP: fix(shell): Switch to annotate snippets for notes #15945)
• Clean up multi-line Shell::warns
• Migrate Shell::warn to use print_report (WIP: fix(shell): Switch to annotate snippets for warnings #15917)
• Switch anyhow::Error to a custom error type
• Cleanup multi-line errors
• Migrate error rendering (src/cargo/lib.rs) to print_report (WIP: fix(cli): Use Shell::print_report for error chains #15922)