Separate files and type hinting improvements

[bmos]

• Use selenium.webdriver.Chrome() and selenium.webdriver.Firefox() instead of selenium.webdriver.chrome.webdriver.WebDriver() and selenium.webdriver.firefox.webdriver.WebDriver()
• Break requestium file into requestium_session, requestium_mixin, and requestium_response
• Add type hints to all functions and classes
• Move session creating to fixture with per-execution initialization (no global webdriver anymore, yay)
  • Needed to remove chrome_webdriver_path from tests for now

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
requestium
requestium.py
requestium_mixin.py					28-31, 59, 64-65, 80, 97, 100, 103, 106, 109, 112, 115, 118, 163, 165, 168-172, 187, 190, 193, 196, 199, 221-237
requestium_response.py					21, 24, 27, 30, 33
requestium_session.py					62, 72, 75, 79-80, 85-87, 90-91, 95-96, 128-132, 140-142, 145-147
Project Total

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