feat: accept stripe webhooks events to sync state faster

[kushsharma]

• A new RPC BillingWebhookCallback(/v1beta1/billing/webhooks/callback/{provider}) allows accepting stripe webhook events being sent to frontier
• This reduces the delay between the state sync between stripe and frontier for customer changes, checkout success, etc.
• Stripe endpoint secret needs to be set in frontier config under billing.stripe_webhook_secrets. It accepts an array of keys and all keys will be tried to validate the event. If the validation fails, event will be discarded.
• feat(frontier): accept stripe billing webhook proton#358

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
frontier	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 19, 2024 1:48pm

[coveralls]

Pull Request Test Coverage Report for Build 9148133038

Details

• 1 of 570 (0.18%) changed or added relevant lines in 18 files are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.04%) to 9.379%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/event/listener.go	0	1	0.0%
internal/api/v1beta1/v1beta1.go	0	1	0.0%
cmd/serve.go	0	3	0.0%
internal/store/postgres/billing_customer_repository.go	0	5	0.0%
pkg/server/interceptors/enrich.go	0	5	0.0%
billing/customer/customer.go	0	7	0.0%
internal/store/postgres/billing_checkout_repository.go	0	8	0.0%
billing/customer/service.go	0	12	0.0%
billing/checkout/service.go	0	13	0.0%
internal/api/v1beta1/billing_webhook.go	0	14	0.0%

Files with Coverage Reduction	New Missed Lines	%
proto/v1beta1/frontier_grpc.pb.go	1	0.0%
proto/v1beta1/frontier.pb.gw.go	2	0.0%

Totals
Change from base Build 9108032192:	-0.04%
Covered Lines:	9560
Relevant Lines:	101934

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💛 - Coveralls