chore: move coverage config to pyproject (#694)

This PR aims to move the contents of `.coveragerc` to `pyproject.toml`
to make the overall file structure more minimal.

Author: SauravMaheshkar

.coveragerc

@@ -85,6 +85,11 @@ ignore_missing_imports = "True"
 disallow_untyped_defs = "True"
 exclude = ["notebooks"]
 
+[tool.coverage.run]
+omit = [
+    "tests/*",
+]
+
 [build-system]
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"