test: update address-codec tests to typescript (#2447)

- Switch files to typescript
- Add missing types in test files
- Change how the codec functions were imported. They now count towards the "% Funcs" calculation, increasing it from 75% to 100%.
- Lint test files

packages/ripple-address-codec/.eslintrc.js

@@ -5,7 +5,7 @@ module.exports = {
   parserOptions: {
     // Enable linting rules with type information from our tsconfig
     tsconfigRootDir: __dirname,
-    project: ['./tsconfig.json'],
+    project: ['./tsconfig.eslint.json'],
 
     sourceType: 'module', // Allow the use of imports / ES modules