Add CI workflow and pre-commit/pre-push hooks for Dart project

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

.githooks/pre-commit

@@ -0,0 +1,9 @@
+#!/usr/bin/env sh
+set -eu
+
+printf '%s\n' 'Running pre-commit checks: dart format + dart analyze'
+
+dart format --output=none --set-exit-if-changed .
+dart analyze --fatal-infos
+
+printf '%s\n' 'Pre-commit checks passed.'

.githooks/pre-push

@@ -0,0 +1,9 @@
+#!/usr/bin/env sh
+set -eu
+
+printf '%s\n' 'Running pre-push checks: dart format + dart test'
+
+dart format --output=none --set-exit-if-changed .
+dart test
+
+printf '%s\n' 'Pre-push checks passed.'