feat: Add code samples for the Workspace Events API advanced service

[gtondello]

Description

Add code samples for the new Apps Script advanced service for the Workspace Events API.

These samples will be embedded in the documentation page for the advanced service.

Is it been tested?

• Development testing done

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have performed a peer-reviewed with team member(s) - @allisongh
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[snippet-bot]

Here is the summary of possible violations 😱

There are 7 possible violations for not having product prefix.

• advanced/events.gs:17, tag events_create_subscription
• advanced/events.gs:46, tag events_list_subscriptions
• advanced/events.gs:65, tag events_get_subscription
• advanced/events.gs:84, tag events_patch_subscription
• advanced/events.gs:107, tag events_reactivate_subscription
• advanced/events.gs:127, tag events_delete_subscription
• advanced/events.gs:146, tag events_get_operation

The end of the violation section. All the stuff below is FYI purposes only.

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Here is the summary of changes.

You are about to add 7 region tags.

• advanced/events.gs:17, tag events_create_subscription
• advanced/events.gs:46, tag events_list_subscriptions
• advanced/events.gs:65, tag events_get_subscription
• advanced/events.gs:84, tag events_patch_subscription
• advanced/events.gs:107, tag events_reactivate_subscription
• advanced/events.gs:127, tag events_delete_subscription
• advanced/events.gs:146, tag events_get_operation

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