Cleaning up types

[antonpirker]

Reorganize our types so they are easy for humans and IDEs to find and use.

As we will support Python 3.8+ we can refrain from using typing_extension

Fixes #4127

[codecov]

❌ 5 Tests Failed:

Tests completed	Failed	Passed	Skipped
9446	5	9441	2011

View the top 3 failed test(s) by shortest run time

tests.integrations.threading.test_threading test_spans_from_multiple_threads[propagate_scope=False]

Stack Traces | 0.108s run time

.../integrations/threading/test_threading.py:246: in test_spans_from_multiple_threads
    (event,) = events
E   ValueError: too many values to unpack (expected 1)

tests.integrations.threading.test_threading test_spans_from_multiple_threads[propagate_scope=False]

Stack Traces | 0.11s run time

.../integrations/threading/test_threading.py:246: in test_spans_from_multiple_threads
    (event,) = events
E   ValueError: too many values to unpack (expected 1)

tests.integrations.threading.test_threading test_spans_from_multiple_threads[propagate_scope=False]

Stack Traces | 0.125s run time

.../integrations/threading/test_threading.py:246: in test_spans_from_multiple_threads
    (event,) = events
E   ValueError: too many values to unpack (expected 1)

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