Implement v2alpha public API DataProviders service.

[SanjayVas]

This change is 

[efoxepstein]

Reviewed 4 of 4 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @SanjayVas)

a discussion (no related file):
We will want a nearly identical service for registering ModelProviders too. Are there parts that we could pull out into helper libraries?

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[SanjayVas]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @efoxepstein)

a discussion (no related file):

Previously, efoxepstein (Eli Fox-Epstein) wrote…

We will want a nearly identical service for registering ModelProviders too. Are there parts that we could pull out into helper libraries?

My plan was to identify these as I add MeasurementConsumers. Likely the certificate parts.

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[efoxepstein]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @SanjayVas)

[wangyaopw]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @oliver-amzn, @SanjayVas, @stevenwarejones, and @zachcwc)

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src/main/kotlin/org/wfanet/measurement/kingdom/service/api/v2alpha/DataProvidersService.kt, line 45 at r1 (raw file):

class DataProvidersService(private val internalClient: DataProvidersCoroutineStub) :
  DataProvidersCoroutineService() {
  override suspend fun createDataProvider(request: CreateDataProviderRequest): DataProvider {

is the plan to implement the create method and hide it from the public?

[SanjayVas]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @oliver-amzn, @stevenwarejones, @wangyaopw, and @zachcwc)

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src/main/kotlin/org/wfanet/measurement/kingdom/service/api/v2alpha/DataProvidersService.kt, line 45 at r1 (raw file):

Previously, wangyaopw (Yao Wang) wrote…

is the plan to implement the create method and hide it from the public?

AFAIK methods can't be hidden, only entire services can.

If we choose to not allow self-service registration, we have a few options. For example:

• For alpha, the current thinking is to lock down the entire Accounts service so that only those with direct access to the cluster can create Accounts and therefore DataProvider/MeasurementConsumer resources. The EDP or MC user would then just be given an API key.
• If this is a requirement for a public deployment, we can restrict access to this method to a configured set of client TLS certificates.

[zachcwc]

Reviewed 4 of 4 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @oliver-amzn, @stevenwarejones, and @wangyaopw)