Adding Azure integration protobuf messages and gRPC methods (#48628)

* Adding Azure integration gRPC messages and RPC methods

* Make derive

* Update proto/accessgraph/v1alpha/azure.proto

Co-authored-by: Tiago Silva <[email protected]>

* Update proto/accessgraph/v1alpha/azure.proto

Co-authored-by: Tiago Silva <[email protected]>

* Update proto/accessgraph/v1alpha/azure.proto

Co-authored-by: Tiago Silva <[email protected]>

* PR feedback

* More PR feedback and generating protobuf code

* Make derive

* Adding identities field to principals, condition to role assignments, and role name to role definitions

* Rebase conflicts

* Did not fully fetch from origin/master when rebasing

* Removing azure config field and keeping poll_interval as-is

* Correct from parent branch

* Apply suggestions from code review

Co-authored-by: Tiago Silva <[email protected]>

* PR feedback

* Adding doc comments to access graph proto

* Adding object type to principals

* Adding location to Azure virtual machines

* Update proto/accessgraph/v1alpha/access_graph_service.proto

Co-authored-by: Tiago Silva <[email protected]>

* Moving Azure Discovery protobuf config to the Azure Discovery PR

* Make grpc

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Co-authored-by: Tiago Silva <[email protected]>