Utilize updated TDA loading and reading

Why these changes are being introduced:

With recent TDA updates, we no longer requiring .load() called
on TIMDEXDataset.  This moves some filtering into the read methods.

How this addresses that need:
* Remove .load() usage for TIMDEXDataset
* Update read methods
* Update dataset fixture to reflect new structure

Side effects of this change:
* None

Relevant ticket(s):
* https://mitlibraries.atlassian.net/browse/TIMX-536

Author: ghukill

pyproject.toml

@@ -4,7 +4,7 @@ line-length = 90
 [tool.mypy]
 disallow_untyped_calls = true
 disallow_untyped_defs = true
-exclude = ["tests/"]
+exclude = ["tests/", "output/"]
 
 [[tool.mypy.overrides]]
 module = ["ijson", "smart_open", "timdex_dataset_api"]
@@ -43,8 +43,7 @@ ignore = [
     "PLR0912",
     "PLR0913", 
     "PLR0915",
-    "S320",
-    "S321", 
+    "S321",
 ]
 
 # allow autofix behavior for specified rules

tests/conftest.py

@@ -38,9 +38,7 @@ def runner():
 
 @pytest.fixture
 def timdex_dataset() -> TIMDEXDataset:
-    td = TIMDEXDataset("tests/fixtures/dataset")
-    td.load()
-    return td
+    return TIMDEXDataset("tests/fixtures/dataset")
 
 
 @pytest.fixture