feat(client): Add experimental support for Cloud Operations API

[mjameswh]

What was changed

• Add experimental support for the Cloud Operations API. Resolves [Feature Request] Cloud Operations API Client #1416.

Details

• Introduced a new NPM package: @temporalio/cloud

• Introduced a new "high level Client" class, CloudOperationsClient. That needs to be distinct from the Client class, as Cloud Operations API goes through a different endpoint and requires different metadata.

• For now, the client provides no "high level" API. Users may use the low level, raw gRPC interface. They are responsible for providing the "temporal-cloud-api-version" metadata when doing so.

• Example usage:

  const apiVersion = '2024-05-13-00';

  // Note that this `connection` can't be shared with a `Client` object, they are distinct things
  const connection = await CloudOperationsConnection.connect({
    address: 'saas-api.tmprl.cloud:443',
    apiKey,
    tls: true,
  });
  const client = new CloudOperationsClient({ connection, apiVersion });

  // This part will get simplified when we add high level operations to the client
  const metadata: Metadata = { ['temporal-cloud-api-version']: apiVersion }
  const response = await client.withMetadata(metadata, async () => {
    return client.cloudService.getNamespace({ namespace });
  });