Playwright adding the first batch of search tests

[emilghittasv]

• Refactoring the footer.py and homepage.py page objects by marking the page functions as public, replacing super() with self and updating function calls in tests.
• Adding a couple of synonyms inside the search_synonym.py page which are used in tests.
• Adding a WordNetLemmatizer instance in utilities.py which is going to help extracting the singular form of words when searching for synonyms of the search term inside the search results.
• Extending playwright coverage with the first batch of search tests inside the test_main_searchbar.py.
• Adding searchTests marker inside pytest.ini and playwright.yml