Configure Yaml formatting

Author: eliericha

.editorconfig

@@ -13,3 +13,6 @@ indent_size = 4
 
 [*.ts]
 indent_size = 4
+
+[*.{yaml,yml}]
+indent_size = 2

.vscode/settings.json.tmpl

@@ -16,6 +16,9 @@
       // Use the same line length as black and flake8
       "vim.textwidth": 88
    },
+   "[yaml]": {
+      "editor.defaultFormatter": "esbenp.prettier-vscode"
+   },
    "terminal.integrated.env.osx": {
       // Dependencies can be provided under the subprojects/ directory. They
       // would automatically be included in GPR_PROJECT_PATH by the following