improves for moderate-size databases

[av-elier]

Thanks for the tool! I found it hard to use with database of moderate size. Added two features.

1. --no-values cli option to not print values. For the case when values are huge or not readable (gzipped for example). This speeds up a lot in my case,
2. --more mode. I have thousand of keys, and can't see the start of the list in terminal 😅. Made something similar to psql, where big listing will print in less of more mode. Not sure of a right way to do it, used os/exec here, works fine.

Both are ali options and disabled by default. Nothing should change without them.

[av-elier]

Realized I can do not interactive

echo 'bucket_name' | bolter ... | less

instead of interactive --more

[hasit]

Merged this. Thanks for contributing @av-elier.