[V2] Replace Config.get with Config.get2

[LoicPoullain]

Issue

Current Config.get function has several faults (#496).

In version 2, Config.get is replaced with Config.get2.

Solution and steps

• Replace all mentions of Config.get with Config.get2.
• Remove ConfigMock
• Remove Config as a service.
• Remove Config.get
• Rename Config.get2 to Config.get

How to upgrade (to include in v2 release)

// Version 1 
const foo = Config.get('settings.foo');
const foo = Config.get('settings.foo', 'hello');
const port = Config.get<number>('settings.port', 3000);
const port = Config.get<number>('settings.port');
const foobar = Config.get<boolean|string>('foobar');

// Version 2
const foo = Config.get('settings.foo'); // Same
const foo = Config.get('settings.foo', 'any', 'hello');
const port = Config.get('settings.port', 'number', 3000);
const port = Config.getOrThrow('settings.port', 'number')
const foobar = Config.get('foobar', 'boolean|string');

ConfigMock as been removed and Config cannot be used as a service anymore. Use the static method Config.get instead.

Checklist

• Add/update/check docs (code comments and docs/ folder).
• Add/update/check tests.
• Update/check the cli generators.