CLIModel refactor step 1 - split interfaces (#824)

* command-interfaces-user-cases-document

* document update

* group change

* bugfixes and doc improvement

* update group description

* remove new sdk release impact on scenario test

* autorest directive and cli directive document

* refactor of code model impl

* fix codemoel layer

* refactor fixes

* refactor

* reserve work

* refactor the codemodel

* example refactor

* resolve conflict part

* resolve conflicts

* Manual config feature gap after refactor (#827)

* manual-config-feature-gap-after-refactor

* fix-test

* add test config

* manual config features and tests

* scenario test

* add array type example

* feature type

* remove unused reference