add support for postgresql driver in function sdk

Author: mangalaman93

examples/postgresql/.eslintrc.json

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+{
+  "env": {
+    "es6": true
+  },
+  "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": "latest",
+    "sourceType": "module"
+  },
+  "plugins": ["@typescript-eslint"]
+}

examples/postgresql/.prettierrc

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+{
+  "plugins": ["assemblyscript-prettier"]
+}

examples/postgresql/README.md

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+# Hypermode Functions Example using PostgreSQL database

examples/postgresql/asconfig.json

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+{
+  "extends": "./node_modules/@hypermode/functions-as/plugin.asconfig.json",
+  "options": {
+    "transform": ["@hypermode/functions-as/transform", "json-as/transform"]
+  }
+}

examples/postgresql/assembly/index.ts

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+import { postgresql } from "@hypermode/functions-as";
+
+export function queryPeople(): string {
+  return postgresql.query("neon", "select * from people", []);
+}
+
+export function getPerson(name: string): string {
+  const query = "select * from people where name = $1";
+  return postgresql.query("neon", query, [name]);
+}
+
+export function addPerson(
+  name: string,
+  age: i32,
+  balance: f64,
+  privkey: i8[],
+  male: boolean,
+  lat: f64,
+  lon: f64,
+): void {
+  const query =
+    "insert into people (name, age, balance, privkey, created_at, male, home)" +
+    " values ($1, $2, $3, $4, $5, $6, $7)";
+
+  postgresql.query("neon", query, [
+    name,
+    age.toString(),
+    balance.toString(),
+    privkey.toString(),
+    new Date(Date.now()).toUTCString(),
+    male.toString(),
+    "(" + lat.toString() + "," + lon.toString() + ")",
+  ]);
+}

examples/postgresql/assembly/tsconfig.json

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+{
+  "extends": "assemblyscript/std/assembly.json",
+  "include": ["./**/*.ts"]
+}

examples/postgresql/hypermode.json

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+{
+  "$schema": "https://manifest.hypermode.com/hypermode.json",
+  "models": {
+    // No models are used by this example, but if you add any, they would go here.
+  },
+  "hosts": {
+    "neon": {
+      "type": "postgresql",
+      "connString": "postgresql://postgres:password@localhost:5432/data?sslmode=disable"
+    }
+  }
+}