`azdev generate-breaking-change-report`: New command to collect Upcoming Breaking Changes from codebase (#446)

* Add command that collects upcoming breaking changes

* Fix when specifying version. Add version

* Add license header

* Fix style

* Fix style

* Fix style

* Fix style

* Align with the design in doc.
bar foo:NAME => bar foo.NAME

* Add new parameter --source to filter only deprecation info or only custom bc

* Update version after merging

* Update version number

* Abstract common calc_selected_mod_names log

* Rename the new command & change argument source since we could not distinguish the deprecate_info generated by pre-announcement

* Adjust the pre-announcement extraction from `deprecation_info`

* Fix style

* Fix style

* Add Help Message

* Fix style

* Update Version in init