Improve the error message of bytes-append* and fix bytes-join

[Antigen-1]

Checklist

• [x] Bugfix
• [x] Feature
• [x] tests included
• [x] documentation

Description of change

1. Check the arguments of bytes-append*.
2. It would be better if bytes-join always returns a newly allocated mutable byte string, just like bytes-append.

[Antigen-1]

I don't quite understand why all the other tests passed except for buildtest-win(3m).

[shhyou]

Rebasing to racket/racket@3c14248 should include the fix for the foreign test

[Antigen-1]

Thanks! I've rebased to this commit.

[Antigen-1]

Thanks! I've repaired these.

[mflatt]

Thanks!