`pd.RangeIndex` should accept `range` as the first argument

[Daverball]

Describe the bug Both according to the docs and the implementation it is valid to pass a python range object as the first argument to pd.RangeIndex

To Reproduce

import pandas as pd

pd.RangeIndex(range(5))  # mypy: arg-type – Argument 1 to "RangeIndex" has incompatible type "range"

Please complete the following information:

• OS: Linux (OpenSUSE Tumbleweed)
• Python 3.10
• mypy 1.0.1
• pandas-stubs 2.0.1.230501

[twoertwein]

Would need to add range here https://github.com/pandas-dev/pandas-stubs/blob/9c301b33b746e28401868b788364cecd00a34655/pandas-stubs/core/indexes/range.pyi#L30 (and probably also for __new__)

[Dr-Irv]

(and probably also for __new__)

We actually don't need __new__() here, so we should delete it.