comparison operators on boolean series are NotImplemented

[mingi3314]

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Issue description

It is not able to compare a boolean Series and a scalar value.

For example, pl.Series(values=[True, False]).__eq__(True) returns a NotImplemented, whereas pl.Series(values=[True, False]).__eq__([True]) returns a boolean series.

I think we need to broadcast a scalar value to the vector.

Reproducible example

import polars as pl

s = pl.Series("boolean_series", [True, True, True, False])
print(s == True)

Expected behavior

Expected

shape: (4,)
Series: 'boolean_series' [bool]
[
	true
	true
	true
	false
]

Actual

False

Installed versions

---Version info---
Polars: 0.16.1
Index type: UInt32
Platform: Linux-5.15.79.1-microsoft-standard-WSL2-x86_64-with-glibc2.31
Python: 3.9.12 (main, Apr 26 2022, 13:27:20) 
[GCC 9.4.0]
---Optional dependencies---
pyarrow: 10.0.1
pandas: 1.5.2
numpy: 1.24.1
fsspec: <not installed>
connectorx: 0.3.1
xlsx2csv: <not installed>
deltalake: <not installed>
matplotlib: 3.6.2

[alexander-beedie]

Fixed; thanks for raising an issue about this edge-case ;)