Add initial Decision (aka PDP) protos

[codingllama]

Initial set of protos for the DecisionService (aka PDP or Policy Decision Point). Subject to change, but committed now so we can build the basic skaffolding for the service in small steps.

Definitions follow #49132 (with a few tweaks and changes here and there).

#49837

Co-authored-by: Forrest [email protected]

[aws-amplify-us-west-2]

This pull request is automatically being deployed by Amplify Hosting (learn more).

Access this pull request here: https://pr-49875.d3pp5qlev8mo18.amplifyapp.com

[codingllama]

(Note: I'll squash all the "Update generated protos" commits once the review is done.)

[codingllama]

PTAL @rosstimothy.

[codingllama]

Friendly ping @rosstimothy @nklaassen @rudream

[rosstimothy]

I suspect there might need to be some alterations to these protos to account for the feedback that Tiago left on the RFD.

[codingllama]

I suspect there might need to be some alterations to these protos to account for the feedback that Tiago left on the RFD.

I've read/replied to some of Tiago's feedback, but I don't think it needs to block approval from this PR. Worst case scenario we will adapt the definitions, but this lets us progress in the meantime.

As noted in the PR description the protos here are subject to change (and the breaking linter is disabled for now).

[codingllama]

Friendly ping @rosstimothy @fspmarshall.

[codingllama]

Friendly ping @rosstimothy.

[codingllama]

Thanks, queued!