Add json_safe method to Response class

[AndreyLebedev345]

Add a new json_safe() method that provides graceful error handling when parsing JSON responses. This method offers several advantages over the standard json() method:

• Returns a configurable default value instead of raising exceptions
• Optionally checks HTTP status before parsing (raise_for_status parameter)
• Handles empty responses gracefully
• Catches JSONDecodeError, UnicodeDecodeError, and ValueError

This is particularly useful for:

• APIs that may return malformed JSON
• Scenarios requiring default fallback values
• Graceful degradation in error conditions
• Rate limiting and service unavailability handling

Example usage:
data = response.json_safe(default={}) data = response.json_safe(default=[], raise_for_status=False)

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Summary

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.