Count aggregation 2

[danieljbruce]

This PR implements the new COUNT feature when querying datastore which returns a count of the number of records instead of the records themselves.

[generated-files-bot[bot]]

Warning: This pull request is touching the following templated files:

• README.md - README.md is managed by synthtool. However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/main/.readme-partials.yaml

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 8 region tags.

• samples/generated/v1/datastore.allocate_ids.js:24, tag datastore_v1_generated_Datastore_AllocateIds_async
• samples/generated/v1/datastore.begin_transaction.js:24, tag datastore_v1_generated_Datastore_BeginTransaction_async
• samples/generated/v1/datastore.commit.js:24, tag datastore_v1_generated_Datastore_Commit_async
• samples/generated/v1/datastore.lookup.js:24, tag datastore_v1_generated_Datastore_Lookup_async
• samples/generated/v1/datastore.reserve_ids.js:24, tag datastore_v1_generated_Datastore_ReserveIds_async
• samples/generated/v1/datastore.rollback.js:24, tag datastore_v1_generated_Datastore_Rollback_async
• samples/generated/v1/datastore.run_aggregation_query.js:24, tag datastore_v1_generated_Datastore_RunAggregationQuery_async
• samples/generated/v1/datastore.run_query.js:24, tag datastore_v1_generated_Datastore_RunQuery_async

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[kolea2]

Closing in favor of https://github.com/googleapis/nodejs-datastore/pull/972