chore: remove grunt and update build scripts (#7838)

* chore: prepare and pack scripts

* chore: update @types/node dep

* chore: remove prepare-dist command from pack-dist

build/prepare-dist.sh

@@ -0,0 +1,69 @@
+#!/bin/bash
+set -x
+set -e
+
+DIST=dist;
+ROOT_DIR=$(cd `dirname $0` && pwd)/..;
+cd "$ROOT_DIR"
+
+mkdir -p "$DIST"
+
+## NPM INSTALL 
+(
+    echo "NPM install in root of the repo"
+    cd "$ROOT_DIR"
+    npm install
+)
+
+## Prepare Platfrom Declarations
+(
+    PACKAGE=tns-platform-declarations;
+
+    echo "Clearing $DIST/$PACKAGE"
+    npx rimraf "$DIST/$PACKAGE"
+    npx rimraf "$DIST/$PACKAGE*.tgz"
+
+    echo "Copying $PACKAGE $DIST/$PACKAGE..."
+    npx ncp "$PACKAGE" "$DIST/$PACKAGE"
+
+    echo "Copying README and LICENSE to $DIST/$PACKAGE"
+    npx ncp LICENSE "$DIST/$PACKAGE"/LICENSE
+
+    cd "$DIST/$PACKAGE"
+
+    echo 'Running npm install...'
+    npm install
+
+    echo 'Running npm test...'
+    npm test
+)
+
+## Prepare Core Modules
+(
+    PACKAGE=tns-core-modules;
+
+    echo "Clearing $DIST/$PACKAGE"
+    npx rimraf "$DIST/$PACKAGE"
+    npx rimraf "$DIST/$PACKAGE*.tgz"
+
+    echo "Copying $PACKAGE $DIST/$PACKAGE..."
+    npx ncp "$PACKAGE" "$DIST/$PACKAGE"
+
+    echo "Cleaning inner readme.md-s ..."
+    npx rimraf "$DIST/$PACKAGE/**/README.md"
+    npx rimraf "$DIST/$PACKAGE/**/Readme.md"
+
+    echo "Copying README and LICENSE to $DIST/$PACKAGE"
+    npx ncp LICENSE "$DIST"/"$PACKAGE"/LICENSE
+    npx ncp README.md "$DIST"/"$PACKAGE"/README.md
+
+    (
+        echo 'TypeScript transpile...'
+        cd "$DIST/$PACKAGE"
+        npm install
+        npx tsc
+    )
+
+    echo "Clearing typescript definitions from private APIs..."
+    node build/clear-private-definitions "$DIST/$PACKAGE"
+)