feat: flatten diag msg with style #368
                
     Merged
            
            
          
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i was working on improved lints that would show code diffs, and i realized that despite using
fn highlighted_note, thefn flatten_messageswould remove the style.so this PR aims to enhance
fn flatten_messagesto optionally preserve styles while flattening (depending on whether the emitter supports styles or not).i added a new
fn label_with_style()to try to avoid breaking API changes for solar users, but not sure if may have missed something. @DaniPopes please lmk if the approach looks good or if we should do it differently.PS:
forge-lintPR in case it is useful foundry-rs/foundry#10846