Add "total" field to ManyEventSubSubscriptions

[zspri]

This PR adds the total field to the responses for CreateEventSubSubscription and GetEventSubSubscriptions, representing the total number of EventSub subscriptions created by a client.

Docs:

• https://dev.twitch.tv/docs/api/reference#create-eventsub-subscription
• https://dev.twitch.tv/docs/api/reference#get-eventsub-subscriptions

[coveralls]

Pull Request Test Coverage Report for Build 1896433296

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.451%

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Totals
Change from base Build 1631408067:	0.0%
Covered Lines:	1237
Relevant Lines:	1338

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💛 - Coveralls