feat: add package variable

[toaction]

Currently, llpyg does not convert global variables declared directly in Python packages. When generating the corresponding LLGo bindings, consider the following:

• What data type of variable needs to be converted?
• Whether to consider mapping data types (e.g., mapping Python int to Go int) or unifying them to py.Object

[toaction]

Basic Data Types

Python's basic data types can be categorized into the following 8 major categories:

• Numeric types: int, float, complex
• Boolean type: bool
• String type: str
• Sequence types: list, tuple, range
• Mapping type: dict
• Set types: set, frozenset
• Binary types: bytes, bytearray, memoryview
• Special type: NoneType

Among them:

• Mutable types: list, dict, set, bytearray

# Numeric types
int_var = 42
float_var = 3.14
complex_var = 3 + 4j

# Boolean type
bool_var = True

# String type
str_var = "Hello, World!"

# Sequence types
list_var = [1, 2, 3]
tuple_var = (1, 2, 3)
range_var = range(10)

# Mapping type
dict_var = {1: "one", 2: "two", 3: "three"}

# Set types
set_var = {1, 2, 3}
frozenset_var = frozenset({1, 2, 3})

# Binary types
bytes_var = b"hello"
bytearray_var = bytearray(b"hello")
mv_var = memoryview(b"hello")

# Special type
none_var = None