Add new properties to immoscout mappings

[Pr0mises]

Added few more properties for buying a house

[orangecoding]

@Pr0mises Thanks.

Can you add tests for this as well in immoscout-web-translator.test?

[Pr0mises]

@orangecoding I did not forget about this PR, but I'm not sure how to add proper tests to this as I'm unable to get a proper test docker up.

I had two thoughts, adding the different house URLs inside testdata.json or add explicit tests inside immoscout-web-translator.test
e.g. testdata.json:

"buyVilla": {
    "url": "https://www.immobilienscout24.de/Suche/de/nordrhein-westfalen/duesseldorf/villa-kaufen?numberofrooms=1.0-10000.0&price=1.0-1000000.0&livingspace=1.0-10000.0&enteredFrom=result_list",
    "type": "housebuy"
  },

immoscout-web-translator.test:

it('should recognize villa-kaufen as housebuy', () => {
    const webUrl =
      'https://www.immobilienscout24.de/Suche/de/berlin/berlin/villa-kaufen';

    const converted = convertWebToMobile(webUrl);
    const queryParams = new URL(converted).searchParams;
    
    expect(queryParams.get('realestatetype')).to.equal('housebuy');
  });

the second one should be already be covered by the
it('shouldFindResultsForEveryTestData', async () => { function using the testdata.json, shouldn't it?

Also for the new PARAM_NAME_MAP those should be already covered shouldn't them?