fix: Apply CultureInfo.InvariantCulture not to be affected by system locale setting

[LeeDongGeon1996]

Description

• Apply CultureInfo.InvariantCulture not to be affected by system locale setting

Fixes:

• decimal.InvalidOperation with small numbers #385
• System.FormatException: Input string was not in a correct format #382

Checklist

• My code follows the existing style, code structure, and naming taxonomy
• I have commented my code, particularly in hard-to-understand areas
• I have performed a self-review of my own code and included any verifying manual calculations
• I have added or updated unit tests that prove my fix is effective or that my feature works, and achieves sufficient code coverage. New and existing unit tests pass locally and in the build (below) with my changes
• My changes generate no new warnings and running code analysis does not produce any issues
• I have added or run the performance tests that depict optimal execution times
• I have made corresponding changes to the documentation

[DaveSkender]

LGTM, but check the Codacy findings to fix, or ignore any false-positives.

[LeeDongGeon1996]

LGTM, but check the Codacy findings to fix, or ignore any false-positives.

@DaveSkender Yeap. All of those can be ignored

[LeeDongGeon1996]

@DaveSkender Just a trivial thing. Which version should be increased? minor or patch?
The thing is that the code change is not that much, but the impact may be big

[DaveSkender]

@DaveSkender Just a trivial thing. Which version should be increased? minor or patch? The thing is that the code change is not that much, but the impact may be big

If there’s no change to the actual API and is not a breaking change, patch is all you’d need. If you consider this a new feature, minor. Just a patch IMO, even if a big relief to users.

[DaveSkender]

I don't have any open concerns with this, LGTM. Please proceed with it.

[LeeDongGeon1996]

@DaveSkender An idea came up with!
The problem is we need to convert C# Decimal into Python Decimal, Culture-Invariantly.
And C# double is automatically converted into Python float and this does not affected by locale setting.
Maybe we can use this (if we take precision loss a bit):

1. Convert C# decimal into C# double first
2. And then, it's converted into Python float by pythonnet.

stock-indicators-python/tests/common/test_cstype_conversion.py

Lines 36 to 42 in c9a40d8

	def test_auto_conversion_from_double_to_float(self):
	from System import Double as CsDouble
	cs_double = CsDouble.Parse('1996.1012', CsCultureInfo.InvariantCulture)
	assert isinstance(cs_double, Number)
	assert isinstance(cs_double, float)
	assert 1996.1012 == cs_double

[LeeDongGeon1996]

@DaveSkender I had a quick test. And this way has max 3x performance gain!

    if cs_decimal is not None:
        return CsDecimal.ToDouble(cs_decimal)

But few tests fails due to precision problem