Add definition of anyarray_uniq function to helpers sql

[sraby]

So, it turns out that this function anyarray_uniq is NOT a pre-loaded array function that we get for free through the pg_catalog. This morning, we started seeing this critical error:

function anyarray_uniq(integer[]) does not exist LINE 8: unnest(anyarray_uniq(array_cat_agg(merged.uniqregids... ^ HINT: No function matches the given name and argument types...

and it turns out that anyarray_uniq was no longer defined. Given that this function lies within the definition of other vital functions that power key WOW interactions, like get_assoc_addrs_from_bbl, our search function.

Since anyarray_uniq does not get created through any script that powers our auto-updating instance of nycdb, I suspect that somehow this function got deleted during our rebuild and there was no code to recreate it.

So, this PR adds a function definition to our helpers.sql file to explicitly build anyarray_uniq whenever we rebuild the db. It also reorders our code a bit to make sure every function declaration runs in the proper order.

[toolness]

Hmm, so I don't believe that adding this function in WoW is the answer... the explosion last night actually occurred because the auto-update of the hpd_registrations dataset failed, which left our nycdb instance in an inconsistent state. See this issue for more details: JustFixNYC/nycdb-k8s-loader#60

I'm going to close this PR because I feel pretty strongly that copying hpd_registrations's functions over to WoW isn't the right solution to this problem--the problem is that some of hpd_registrations's functions are being deleted by our auto-updating nycdb and not being restored, so we need to fix that. 😣