feat: add pre-commit

- ran 'pre-commit install'
- add pre-commit configuration
- test yaml + terraform related checks
- terragrunt-hcl-fmt for policy hcl files

.pre-commit-config.yaml

@@ -0,0 +1,12 @@
+repos:
+  - repo: https://github.com/gruntwork-io/pre-commit
+    rev: v0.1.30
+    hooks:
+      - id: terraform-fmt
+      - id: terraform-validate
+      - id: tflint
+      - id: terragrunt-hcl-fmt
+  - repo: https://github.com/adrienverge/yamllint.git
+    rev: v1.37.1
+    hooks:
+      - id: yamllint