NOOP: Format all layer's SQL code (#917)

I would like to reformat all of our SQL to have a concise coding style.
This makes it far easier to understand the code for a casual contributor,
and lets us spot errors more easily.

Most importantly, it makes it much easier to grep (search) the code because it is more likely to be in the same syntax

Some key changes:
* SQL keywords are always UPPERCASE, e.g. `SELECT WHEN AS END ...`
* types, variables, aliases, and field names (identifiers) are always lower case
* `LANGUAGE 'plpgsql'` is now `LANGUAGE plpgsql` (no quotes)
* a few minor spacing/semicolon cleanups

P.S. Per @TomPohys request, `TABLE` is spelled using upper case despite being a type for consistency with PG Docs. Same for `LANGUAGE SQL` vs `LANGUAGE plpgsql`.

layers/place/types.sql

@@ -1,9 +1,11 @@
-DO $$
-BEGIN
-    IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'city_place') THEN
-        CREATE TYPE city_place AS ENUM ('city', 'town', 'village', 'hamlet', 'suburb', 'neighbourhood', 'isolated_dwelling');
-    END IF;
-END
+DO
+$$
+    BEGIN
+        IF NOT EXISTS(SELECT 1 FROM pg_type WHERE typname = 'city_place') THEN
+            CREATE TYPE city_place AS enum ('city', 'town', 'village', 'hamlet', 'suburb', 'neighbourhood', 'isolated_dwelling');
+        END IF;
+    END
 $$;
 
-ALTER TABLE osm_city_point ALTER COLUMN place TYPE city_place USING place::city_place;
+ALTER TABLE osm_city_point
+    ALTER COLUMN place TYPE city_place USING place::city_place;