add example sql for loans streamlit app and new exposure

observe/streamlit/loans-example/example.sql

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+-- These are useful queries to run for demo purposes
+
+use role loader;
+use warehouse wh_loading;
+
+-- source table needs to have change tracking enabled
+alter table RAW.LOANS.PERSONAL_LOANS set CHANGE_TRACKING = true;
+
+-- see the rows in a table
+select count(*)
+from RAW.LOANS.PERSONAL_LOANS;
+
+-- delete records from a table
+delete
+from RAW.LOANS.PERSONAL_LOANS
+where left(addr_state, 1)> 'A';
+
+-- dropping dymanic table
+drop dynamic table balboa_dev.gomezn.PERSONAL_LOANS;

transform/models/L4_exposures/loan_analytics.yml

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+version: 2
+
+exposures:
+
+  - name: loans_analysis
+    type: dashboard
+    maturity: medium
+    url: https://ddyxorozsz-gay725.east-us-a.datacoves.com/
+    description: >
+      Top 10 states with loans
+
+    depends_on:
+      - source('LOANS', 'PERSONAL_LOANS')
+
+    owner:
+      name: Noel Gomez
+      email: gomezn@datacoves.com