Firestore API: Add COLLECTION_GROUP to queryScope

[btorresgil]

Collection group scope was recently added to Cloud Firestore indexes.

Here is an example of one pulled with gcloud CLI:

$ gcloud beta firestore indexes composite describe CICAgJim12AF
┌──────────────┬──────────────────┬──────────────────┬───────┬─────────────┬───────────┬──────────────┐
│     NAME     │ COLLECTION_GROUP │   QUERY_SCOPE    │ STATE │ FIELD_PATHS │   ORDER   │ ARRAY_CONFIG │
├──────────────┼──────────────────┼──────────────────┼───────┼─────────────┼───────────┼──────────────┤
│ CICAgJim12AF │ mycollection     │ COLLECTION_GROUP │ READY │ userId      │ ASCENDING │              │
│              │                  │                  │       │ myList      │           │ CONTAINS     │
└──────────────┴──────────────────┴──────────────────┴───────┴─────────────┴───────────┴──────────────┘

Notice that QUERY_SCOPE has a value of COLLECTION_GROUP which is a valid option for this parameter.

See also Firestore release notes for May 7 2019: https://cloud.google.com/firestore/docs/release-notes

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[rileykarson]

LGTM! Do you mind updating the description

The scope at which a query is run. Defaults to `"COLLECTION"`.

to this?

The scope at which a query is run. One of `"COLLECTION"` or `"COLLECTION_GROUP"`. Defaults to `"COLLECTION"`.

[modular-magician]

Hi! I'm the modular magician, I work on Magic Modules.
This PR seems not to have generated downstream PRs before, as of 2a5aa3c27c9187106d37e8b145dbf10f506e3e0d.

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No diff detected in terraform-google-conversion.
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New Pull Requests

I built this PR into one or more new PRs on other repositories, and when those are closed, this PR will also be merged and closed.
depends: hashicorp/terraform-provider-google-beta#919
depends: hashicorp/terraform-provider-google#3972

[modular-magician]

Hi! I'm the modular magician, I work on Magic Modules.
I see that this PR has already had some downstream PRs generated. Any open downstreams are already updated to your most recent commit, ab44cd8.

Pull request statuses

No diff detected in terraform-google-conversion.
No diff detected in Ansible.
No diff detected in Inspec.

New Pull Requests

I built this PR into one or more new PRs on other repositories, and when those are closed, this PR will also be merged and closed.
depends: hashicorp/terraform-provider-google-beta#1048
depends: hashicorp/terraform-provider-google#4258