Add an optional verbose flag to the Dhall configuration.

It is OR'd with the --verbose CLI flag. Defaults to False
when omitted, via record merge with a defaults record in
readConfig.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Change-Id: Ic3d3ef408e97a2b083c910eee685e57043ee6f7e
4 files changed