arrow

GH-41327: [Ruby] Show type name in Arrow::Table#to_s (#41328)

### Rationale for this change

It's useful to detect type difference.

### What changes are included in this PR?

Add `:show_column_type` option to `Arrow::Table#to_s` and enables it by default.

This is a backward incompatible change but this'll help users.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

Yes.

**This PR includes breaking changes to public APIs.**

* GitHub Issue: #41327

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>