* [VTA][Chisel] add scalafmt and format existing scala codebase

* change column width to 100

* add scalafmt conf file as a valid file type

* add asf header to scalafmt conf file and rerun formatter

* add support to event counters in VTA

* fix comment

* fix event-counter interface parameter

* no longer needed

* add sim back

* add docs to event counters

* fix docs

* add more details about event counting

* make dpi-module docs more accurate