vortex-array constructor inconsistencies #4420

So I read through the other canonical arrays to check for new_unchecked methods, and they are wildly inconsistent:

• bool: No new_unchecked even though there is a try_new
• chunked: pub unsafe fn new_unchecked
• datetime: Panicking new (and no try_new; maybe this is okay since it is just checking the time unit but this is still inconsistent)
• decimal: No new_unchecked even though there is a try_new
• list: No new_unchecked even though there is a try_new
• primitive: No new_unchecked NOR a try_new, which is terrible because it only has a new that panics if the inputs are invalid
• struct: pub(crate) fn new_unchecked (this isn't unsafe! A function being private does not make it safe!)
• varbin: No new_unchecked even though there is a try_new
• varbinview: pub unsafe fn new_unchecked

There are only a few that "make sense" to me:

• constant: No new_unchecked (this makes sense since it is infallible and there is no try_new)
• extension: No new_unchecked (this makes sense since it (seems to be) infallible and there is no try_new)
• null: No new_unchecked (this makes sense since it is infallible and there is no try_new)

I'm going to address all of these in a followup PR because this is not great.

Originally posted by @connortsui20 in #4405 (comment)