Add new isort rule

Author: Kludex

pyproject.toml

@@ -31,6 +31,7 @@ ignore = [
 "docs/**/*.*" = ["A001"]
 
 [tool.ruff.lint.isort]
+required-imports = ["from __future__ import annotations"]
 detect-same-package = false # to not consider instrumentation packages as first-party
 known-first-party = ["opentelemetry"]
 known-third-party = [