v21.2.19
build: update `aspect_rules_js` to `3.0.2`
build: use rules_angular to build MCP find examples tool database
build: remove `build-schema` script
refactor(@angular/cli): update aio links -> adev links
refactor: update copyright from Google Inc to Google LLC
refactor: reduce dependencies on `@angular-devkit/core`
build: refactor ng_package substitutions
build: fix node.js toolchains setup