GH-100117: Make co_lines more efficient

[brandtbucher]

Basically, this just merges all of the entries for a given line range into a single tuple. This can have a dramatic effect on the size of the resulting iterator:

Before:

>>> from dis import dis as example
>>> lines = list(example.__code__.co_lines())
>>> len(lines)
148

After:

>>> from dis import dis as example
>>> lines = list(example.__code__.co_lines())
>>> len(lines)
39

• Issue: code.co_positions behaviour does not match documentation #100117

[markshannon]

Thanks