some database name lengths are not right

[davepacheco]

RFD 4 says that names must be 1-63 characters long and we validate this. In the database schema, most names use STRING(63). A few were using other lengths so I'm updating them to be consistent. This prevents us from storing a field that we won't be able to deserialize. (They might actually deserialize because we don't check that...but that would be a separate bug.)

I skipped two:

• update_available_artifact has a "name" but it's not stored in Rust as a Name so I didn't touch it
• saga has a "template_name" but it's going away in update to steno 0.2.0 #1532