Remove import for goldstein and filtering from top level `__init_…

…_.py` (#530)

the interpolate one gets numba, unwrap, leads to much longer import times for CLIs

Also fix the `get_dates` within time series for cases with longer filenames

src/dolphin/__init__.py

@@ -5,5 +5,3 @@
 from ._log import *
 from ._show_versions import *
 from ._types import *
-from .goldstein import goldstein
-from .interpolation import interpolate

src/dolphin/timeseries.py

@@ -953,7 +953,7 @@ def invert_unw_network(
 
     """
     if ifg_date_pairs is None:
-        ifg_date_pairs = [get_dates(f) for f in unw_file_list]
+        ifg_date_pairs = [get_dates(f)[:2] for f in unw_file_list]
 
     try:
         # Ensure it's a list of pairs

src/dolphin/unwrap/_unwrap.py

@@ -10,8 +10,10 @@
 import numpy as np
 from tqdm.auto import tqdm
 
-from dolphin import goldstein, interpolate, io
+from dolphin import io
 from dolphin._types import Filename
+from dolphin.goldstein import goldstein
+from dolphin.interpolation import interpolate
 from dolphin.utils import DummyProcessPoolExecutor, full_suffix
 from dolphin.workflows import UnwrapMethod, UnwrapOptions