Add @microsoft/api-extractor to detect public API changes (#1962)

* add @microsoft/api-extractor to botbuilder-core

* add api-extractor to libraries

* run api-extractor on all libs except for:
 * botframework-connector
 * adaptive-expressions (in preview)
 * botbuilder-lg (in preview)

* support friendlier jsonc render on GitHub

* bump @microsoft/api-extractor to ^7.7.12 b/c microsoft/rushstack/issues/1095

* regenerate bf-schema.api.md after master merge

* add codeowners, regen core & dialogs api.md

* regenerate botbuilder.api.md after merging master

.gitattributes

@@ -1,3 +1,11 @@
 # .gitattributes in project root
 package.json text eol=lf
-package-lock.json text eol=lf
+package-lock.json text eol=lf
+
+# Rush's JSON config files use JavaScript-style code comments.  The rule below prevents pedantic
+# syntax highlighters such as GitHub's from highlighting these comments as errors.  Your text editor
+# may also require a special configuration to allow comments in JSON.
+#
+# For more information, see this issue: https://github.com/microsoft/rushstack/issues/1088
+#
+*.json  linguist-language=JSON-with-Comments

.github/CODEOWNERS

@@ -0,0 +1,6 @@
+# For all public API changes
+/libraries/*/etc/* @benbrown @stevengum @stevenic
+
+# For maintenance of shipped packages dependencies and devDependencies
+# Codeowners should use tools such as https://bundlephobia.com/
+/libraries/*/package.json @benbrown @stevengum @stevenic

.gitignore

@@ -12,6 +12,10 @@
 libraries/functional-tests/**/lib
 libraries/functional-tests/**/*.vscode/launch.json
 
+# @microsoft/api-extractor
+libraries/*/temp
+libraries/*/dist 
+
 # User-specific files
 *.suo
 *.user

libraries/adaptive-expressions/package.json

@@ -33,20 +33,21 @@
     "moment-timezone": "^0.5.25"
   },
   "devDependencies": {
+    "@microsoft/api-extractor": "^7.7.12",
     "@types/jspath": "^0.4.0",
     "@types/mocha": "^5.2.5",
     "@types/node": "^10.12.18",
+    "mocha": "^5.2.0",
     "nyc": "^15.0.0",
     "ts-node": "^4.1.0",
-    "typescript": "3.5.3",
-    "mocha": "^5.2.0"
+    "typescript": "3.5.3"
   },
   "scripts": {
     "build": "tsc",
-    "test": "tsc && mocha tests/ --timeout 60000",
-    "clean": "erase /q /s .\\lib",
     "build-docs": "typedoc --theme markdown --entryPoint adaptive-expressions --excludePrivate --includeDeclarations --ignoreCompilerErrors --module amd --out ..\\..\\doc\\adaptive-expressions .\\lib\\index.d.ts --hideGenerator --name \"Bot Builder SDK - Expression\" --readme none",
-    "set-version": "npm version --allow-same-version ${Version}"
+    "clean": "erase /q /s .\\lib",
+    "set-version": "npm version --allow-same-version ${Version}",
+    "test": "tsc && mocha tests/ --timeout 60000"
   },
   "files": [
     "/lib",