Object key print in formatter weak and incorrect

Theres a object key printing bug in printJson (jsonformatter.cpp)

os << get_color(AnsiColor::KEY) << '"' << kv.first << "\":" << get_reset();

We currently print ":" without space after colon, then later add space only in non-compact mode:cpp

os << (!compact ? " " : "");

We should print a space after : colon

Start in jsonformatter.cpp at the printJson entry point and inspect the shown object-key output and following compact-mode conditional. Verify the expected spacing in compact and non-compact output; the issue is done when object keys print the intended colon spacing without breaking compact formatting.

Written by the indexing model from the issue text.