Reorganize meta files for ESLint packages (#10714)

* Move COC and CONTRIBUTING

* Add changelog links

* Reorganize gitignore and licenses

scripts/clone-license.sh

@@ -1,3 +1,4 @@
 echo "Cloning LICENSE to babel packages"
 cat LICENSE
 ls -db ./packages/*/ | egrep -v '.*packages\/(babel-parser|babel-plugin-transform-object-assign)\/?$' | xargs -n 1 cp LICENSE
+ls -db ./eslint/*/ | egrep -v '.*eslint\/(babel-eslint-plugin)\/?$' | xargs -n 1 cp LICENSE