Add cli for configuring DAG bundle backends

[jedcunningham]

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[Prab-27]

@jedcunningham , I'd like to work on this issue.

[jedcunningham]

Hi @Prab-27, sorry, we've gone a different direction and these are being configured in configuration instead (#44924). However, there is some other cli/api work if you are open to it. I'll tag you in those issues later today.

[Prab-27]

Thanks @jedcunningham. I'd like to work on that type of issue. If there are any, tag me.

[jedcunningham]

@Prab-27, there are a number of issues in the project for AIP-66, if you'd like to pick up one of them.