Improve printing of several arguments (#55754)
Following a discussion on
[Discourse](https://discourse.julialang.org/t/string-optimisation-in-julia/119301/10?u=gdalle),
this PR tries to improve `print` (and variants) for more than one
argument.
The idea is that `for` is type-unstable over the tuple `args`, while
`foreach` unrolls.
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Co-authored-by: Steven G. Johnson <stevenj@mit.edu>
