fix: handle parenthesized imports in getImportedSymbolMap

[ranihorev]

Fixes a bug where imports with parentheses (both single-line and multi-line) were not properly parsed, causing the extension to fail to copy the full import path. For example:

from file.path import (MyClass, OtherClass)

a = MyClass()

Copying MyClass before ended up with file.path vs now file.path.MyClass