Give me a way to bring in the "core" bicep files

[bradygaster]

I'd love to have a way of doing something like azd init --core to lay down all the core infrastructure files when i set up a new AZD template. I typically start with my code, then i azd init, then i go pull from other places. it'd be nifty if there was either a switch on init or an additional to command to drop in all the core files.

[savannahostrowski]

We'd discussed adding core/ to the Bicep starter template. Might be worth doing that while we sort out the whole registry thing @ellismg.

[jongio]

As a workaround you can do azd init -t jongio/azd-starter-bicep-core, which is updated with latest from azure-dev/main

[rajeshkamal5050]

Pulling this into next sprint since @aaronpowell was also requesting core/default ones to be available as part of starters.