MLBEDSW-7429: Add dev dependencies

Add dev dependencies to pyproject.toml. They can be installed by using:
`pip install ethos-u-vela[dev]`

Change-Id: I212ed7c39c9c7e93896a1e6a25cff7c7102d2c7f
Signed-off-by: Raul Farkas <raul.farkas@arm.com>
diff --git a/pyproject.toml b/pyproject.toml
index d8cbe66..0c88abb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,6 +41,15 @@
 ]
 dynamic = ["readme", "version"]
 
+[project.optional-dependencies]
+dev = [
+    "pytest",
+    "pytest-cov",
+    "pre-commit",
+    "build",
+    "setuptools_scm[toml]<6"
+]
+
 [project.urls]
 Homepage = "https://git.mlplatform.org/ml/ethos-u/ethos-u-vela.git/"