feat(base): start base sql layers

Author: sam bacha

dune/base/_price.sql

@@ -0,0 +1,11 @@
+(
+                    SELECT date_trunc('day', minute) AS day, contract_address AS token, AVG(price) AS price
+                    FROM prices.usd
+                    GROUP BY 1, 2
+
+                    union all
+
+                    select date_trunc('day', hour) AS day, contract_address AS token, AVG(median_price) AS price
+                    FROM dex.view_token_prices
+                    GROUP BY 1, 2
+    ) as prices on b.day = prices.day