chore: use prettier instead of clang-format (#7014)

* chore: add and configure prettier

* chore: remove clang-format

* chore: remove clang-format config

* chore: lint additional ts files

* chore: fix lint errors in blocks

* chore: add prettier-ignore where needed

* chore: ignore js blocks when formatting

* chore: fix playground html syntax

* chore: fix yaml spacing from merge

* chore: convert text blocks to use arrow functions

* chore: format everything with prettier

* chore: fix lint unused imports in blocks

.prettierignore

@@ -0,0 +1,31 @@
+# Build Artifacts
+/msg/*
+/build/*
+/dist/*
+/typings/*
+/docs/*
+
+# Tests other than mocha unit tests
+/tests/blocks/*
+/tests/themes/*
+/tests/compile/*
+/tests/jsunit/*
+/tests/generators/*
+/tests/mocha/webdriver.js
+/tests/screenshot/*
+/tests/test_runner.js
+/tests/workspace_svg/*
+
+# Demos, scripts, misc
+/node_modules/*
+/generators/*
+/demos/*
+/appengine/*
+/externs/*
+/closure/*
+/scripts/gulpfiles/*
+CHANGELOG.md
+PULL_REQUEST_TEMPLATE.md
+
+# Don't bother formatting js blocks since we're getting rid of them
+/blocks/*.js