Implement Display for ArrayMetadata

[lwwmanning]

and remove e.g.,

// TODO(ngates): use Display for metadata

https://github.com/spiraldb/vortex/blob/0ad2232/vortex-array/src/tree.rs#L60

[danking]

@lwwmanning I'm looking through the good first issue issues and found this.

Do you have an opinion on the format? BoolMetadata at least has a validity, length, and bit_offset. I could do something like "bool ffa1 64 0" where the validity vector is encoded as a hex string?

[robert3005]

We should not do this right now. All of array metadata have to be audited for size and it will likely make the display completely different

[robert3005]

Should wait for #396

[robert3005]

done in #975