feat: Add keyword argument support for train_from_stream

[cardmagic]

Summary

The train_from_stream method currently only accepts positional arguments:

classifier.train_from_stream(:spam, File.open("spam_corpus.txt"))

For API consistency with other methods like train and add, it would be nice to also support keyword arguments:

classifier.train_from_stream(spam: File.open("spam_corpus.txt"))

Affected Classes

• Classifier::Bayes
• Classifier::LSI
• Classifier::KNN
• Classifier::LogisticRegression

Current Behavior

classifier.train_from_stream(spam: File.open("corpus.txt"))
# => ArgumentError: wrong number of arguments (given 0, expected 2)

Expected Behavior

classifier.train_from_stream(spam: File.open("corpus.txt"))
# => Works, trains the :spam category from the stream