dev: refactor doctor

Create a new interactive `dev doctor` experience, so you don't have to
copy-paste commands from `dev doctor` and it can solve problems for you.

Now `dev doctor` will be interactive by default and will ask for user
input to confirm the actions it's going to take. You can also set
`--autofix` to automatically agree to some default actions without
having to interactive. Interactive doctor can be disabled with
`--interactive=false`.

Epic: none
Release note: None

dev

@@ -8,7 +8,7 @@ fi
 set -euo pipefail
 
 # Bump this counter to force rebuilding `dev` on all machines.
-DEV_VERSION=67
+DEV_VERSION=68
 
 THIS_DIR=$(cd "$(dirname "$0")" && pwd)
 BINARY_DIR=$THIS_DIR/bin/dev-versions