build(migrations): add sql files to create tables

db/migrations/20210429225611_create_consumer.down.sql

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+DROP TABLE customers;

db/migrations/20210429225611_create_consumer.up.sql

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+CREATE TABLE customers (
+  id BIGINT(20) UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT,
+  name VARCHAR(36),
+  email VARCHAR(36)
+);

db/migrations/20210429225750_create_product.down.sql

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+DROP TABLE products;

db/migrations/20210429225750_create_product.up.sql

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+CREATE TABLE products (
+    id BIGINT(20) UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT,
+    name VARCHAR(36),
+    price FLOAT
+);

db/migrations/20210429225805_create_user.down.sql

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+DROP TABLE users;

db/migrations/20210429225805_create_user.up.sql

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+CREATE TABLE users
+(
+    id SERIAL PRIMARY KEY,
+    username VARCHAR(100) NOT NULL UNIQUE
+);