[w3c/push-api] User preference for timing (#257)

The document states clearly the user must authorize the push:

> User agents MUST NOT provide Push API access to webapps without the express permission of the user. User agents MUST acquire consent for permission through a user interface for each call to the subscribe() method, unless a previous permission grant has been persisted, or a prearranged trust relationship applies. Permissions that are preserved beyond the current browsing session MUST be revocable.

There’s also a section for how to deal with expired pushes and a section for push subscription options.

Does this allow a user to set a period of time between pushes?

For instance, a person may take longer to read/complete a sequence due to a disability. If the screen changes too quicklly, due to a push, they could lose track of what they are doing. For these users, they may prefer to change their settings. 

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