feat(compute): add compute snapshot schedule create/get/edit/list/delete samples

[TetyanaYahodska]

Description

Documentation - https://cloud.google.com/compute/docs/disks/scheduled-snapshots?authuser=0#create_snapshot_schedule , https://cloud.google.com/compute/docs/disks/manage-snapshot-schedules?authuser=0#gcloud_3, https://cloud.google.com/compute/docs/disks/manage-snapshot-schedules?authuser=0#view_snapshot_schedules
Fixes #

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Checklist

• I have followed Sample Format Guide
• pom.xml parent set to latest shared-configuration
• Appropriate changes to README are included in PR
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• Tests pass: mvn clean verify required
• Lint passes: mvn -P lint checkstyle:check required
• Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• compute/cloud-client/src/main/java/compute/snapshotschedule/CreateSnapshotSchedule.java:19, tag compute_snapshot_schedule_create
• compute/cloud-client/src/main/java/compute/snapshotschedule/DeleteSnapshotSchedule.java:19, tag compute_snapshot_schedule_delete
• compute/cloud-client/src/main/java/compute/snapshotschedule/EditSnapshotSchedule.java:19, tag compute_snapshot_schedule_edit
• compute/cloud-client/src/main/java/compute/snapshotschedule/GetSnapshotSchedule.java:19, tag compute_snapshot_schedule_get
• compute/cloud-client/src/main/java/compute/snapshotschedule/ListSnapshotSchedules.java:19, tag compute_snapshot_schedule_list

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[iennae]

@gemini review