feat: add host and port support to TuonoConfig

[Valerioageno]

This PR does three things:

1. Add the server property to tuono.config.ts
2. Apply the server defaults
3. Generate the .tuono/config/config.json that will be read by the rust server

---

In the first commit I added the support for the new object

const config: TuonoConfig = {
   server: {
       host: 'localhost',
       port: 3000
   }
}

I messed up a bit the files because in the same commit I split loadConfig and normalizeConfig in two different files to better manage the test files.

Note

In my opinion utils.ts should be used for silly reusable functions - not core functionalities

The only test that has been added is:

// config/normalize-config.spec.ts
describe('server', () => {
    it('should assign the host and port defined by the user', () => {
      const config: TuonoConfig = {
        server: { host: '0.0.0.0', port: 8080 },
      }

      expect(normalizeConfig(config)).toStrictEqual(
        expect.objectContaining({
          server: expect.objectContaining({
            host: '0.0.0.0',
            port: 8080,
          }) as unknown,
        }),
      )
    })
  })