enhancing robustness of int/float castings for string values containing commas

[Speedy1991]

I run into this problem again and again and it is always annoying to fix it

Feature Request Type

• Core functionality
• Alteration (enhancement/optimization) of existing feature(s)
• New behavior

Description

ValueError: could not convert string to float: '3,3'
  File "graphql/type/scalars.py", line 123, in serialize_float
    num = output_value if isinstance(output_value, float) else float(output_value

Currently values with , will break int/float resolvers, but most times this is not a real error.

It would be awesome if we can handle , like . if the value is a string like this:

output_value = output_value.replace(',', '.').strip() if isinstance(output_value, str) else output_value
num = output_value if isinstance(output_value, float) else float(output_value)

The same happens with integers

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