Python-SDK does not handle import aliases

[rofrano]

Describe the bug

The Python-sdk does not handle an import that has been renamed to an alias such as import pandas as pd.

To Reproduce

Steps to reproduce the behavior:

1. Run this code:

from cldk.analysis.python.treesitter import PythonSitter

code = """
import io
from flask import Flask
import pandas as pd

def hello():
  print("Hello!")
"""

if __name__ == "__main__":
    python_sitter = PythonSitter()

    print("Statements:\n")
    import_statements = python_sitter.get_all_imports(code)
    for statement in import_statements:
        print(statement)

    print("\nDetails:\n")
    import_details = python_sitter.get_all_imports_details(code)
    for detail in import_details:
        print(detail)

Expected behavior

I expect to get all of the imports parsed correctly from the get_all_imports_details() method.

Instead I got this output:

Statements:

import io
import pandas as pd
from flask import Flask

Details:

from_statement='' imports=['io']
from_statement='' imports=[]
from_statement='flask' imports=['Flask']

Notice the from_statement='' imports=[] in the output instead of the pandas import.

Logs
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Additional context
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