feat(sql): add common sql helper scripts

scripts/sql/README.md

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+Collection of common useful SQL scripts
+
+Example:
+```bash
+docker compose exec -T -u postgres postgres psql -U postgres -d mapswipe < scripts/sql/db-size.sql
+```
+> [!IMPORTANT]
+> Make sure to change Postgres user and Postgres database accordingly

scripts/sql/db-size.sql

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+SELECT
+  datname AS database_name,
+  pg_size_pretty(pg_database_size(datname)) AS size
+FROM
+  pg_database
+ORDER BY
+  pg_database_size(datname) DESC;

scripts/sql/table-size.sql

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+SELECT
+  schemaname,
+  relname AS table_name,
+  pg_size_pretty(pg_total_relation_size(relid)) AS total_size,
+  pg_size_pretty(pg_relation_size(relid)) AS data_size,
+  pg_size_pretty(pg_indexes_size(relid)) AS index_size
+FROM
+  pg_catalog.pg_statio_user_tables
+ORDER BY
+  pg_total_relation_size(relid) DESC;