[ACS-2197] changelog generation with ADF CLI (#7350)

* print app version instead of error

* initial diff implementation

* markdown rendering

* render md output

* html output

* configurable exclude filter

* provide docs

lib/cli/templates/changelog-md.ejs

@@ -0,0 +1,11 @@
+---
+Title: Changelog for <%= projName %> v<%= projVersion %>
+---
+
+# Changelog
+
+<% for(var idx in commits) {
+    commit = commits[idx];
+-%>
+- [<%= commit.hash %>](<%= repo_url %>/commit/<%= commit.hash %>) <%= commit.subject %>
+<% } %>