chore: use absolute imports (#2796)

chore: use abosolute imports

Signed-off-by: Henry Schreiner <henryfs@princeton.edu>

pyproject.toml

@@ -211,6 +211,7 @@ extend-select = [
   "RUF",         # Ruff-specific
   "SIM",         # flake8-simplify
   "TID251",      # flake8-tidy-imports.banned-api
+  "TID252",      # flake8-tidy-imports.relative-imports
   "UP",          # pyupgrade
   "YTT",         # flake8-2020
   "EXE",         # flake8-executable
@@ -236,6 +237,7 @@ ignore = [
   "PTH123",  # open -> Path.open
 ]
 flake8-unused-arguments.ignore-variadic-names = true
+flake8-tidy-imports.ban-relative-imports = "all"
 
 [tool.ruff.lint.flake8-tidy-imports.banned-api]
 "typing.Mapping".msg = "Use collections.abc.Mapping instead."
@@ -245,7 +247,8 @@ flake8-unused-arguments.ignore-variadic-names = true
 "typing.Set".msg = "Use collections.abc.Set instead."
 
 [tool.ruff.lint.per-file-ignores]
-"unit_test/*" = ["PLC1901"]
+"unit_test/*" = ["PLC1901", "TID252"]
+"test/*" = ["TID252"]
 "bin/*" = ["TID251"]
 "cibuildwheel/resources/install_certifi.py" = ["PTH"]