Final typing fixes + add Pyright to CI (#1944)

* knocking out a couple

* Fix more errors

* Add pyright

* Remove some unnecessary cv2 type ignores, warning on missing imports
(for missing tinycudann)

* Minor annotation fixes

* Update docs

* Drop `None` from temporal distortion output

---------

Co-authored-by: Brent Yi <yibrenth@gmail.com>

.github/workflows/core_code_checks.yml

@@ -36,6 +36,9 @@ jobs:
         run: ruff docs/ nerfstudio/ tests/
       - name: Run Black
         run: black docs/ nerfstudio/ tests/ --check
+      - name: Run Pyright
+        run: |
+          pyright
       - name: Test with pytest
         run: |
           pytest