feat: add pagination to list all invoice API

[AmanGIT07]

Description

Adds pagination to list all invoice API. page_num and page_size params can be used to modulate the pages. count returns the total number of items (not the count of items in response) so that it can be consumed for different logics if needed.

API Testing

1. Default behaviour

Request:

curl --location 'http://localhost:8400/frontier-api/v1beta1/admin/billing/invoices' 

Response:

{
    "invoices": [
        {
            "id": "",
            "customer_id": "",
            "provider_id": "",
            "state": "",
            "currency": "",
            "amount": "",
            "hosted_url": "",
            "due_date": null,
            "effective_at": null,
            "period_start_at": null,
            "period_end_at": null,
            "metadata": {},
            "created_at": "",
            "customer": null
        },
        {
            "id": "",
            "customer_id": "",
            "provider_id": "",
            "state": "",
            "currency": "",
            "amount": "",
            "hosted_url": "",
            "due_date": null,
            "effective_at": null,
            "period_start_at": null,
            "period_end_at": null,
            "metadata": {},
            "created_at": "",
            "customer": null
        },
        {
            "id": "",
            "customer_id": "",
            "provider_id": "",
            "state": "",
            "currency": "",
            "amount": "",
            "hosted_url": "",
            "due_date": null,
            "effective_at": null,
            "period_start_at": null,
            "period_end_at": null,
            "metadata": {},
            "created_at": "",
            "customer": null
        }
    ],
    "count": 3
}

2. Request specific page & size

Request:

curl --location 'http://localhost:8400/frontier-api/v1beta1/admin/billing/invoices?page_num=2&page_size=2

Response:

{
    "invoices": [
        {
            "id": "",
            "customer_id": "",
            "provider_id": "",
            "state": "",
            "currency": "",
            "amount": "",
            "hosted_url": "",
            "due_date": null,
            "effective_at": null,
            "period_start_at": null,
            "period_end_at": null,
            "metadata": {},
            "created_at": "",
            "customer": null
        }
    ],
    "count": 3
}

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Name	Status	Preview	Comments	Updated (UTC)
frontier	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 29, 2024 6:23am

[coveralls]

Pull Request Test Coverage Report for Build 10609812154

Details

• 0 of 64 (0.0%) changed or added relevant lines in 4 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.005%) to 9.488%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/api/v1beta1/billing_invoice.go	0	6	0.0%
proto/v1beta1/admin.pb.go	0	15	0.0%
internal/store/postgres/billing_invoice_repository.go	0	21	0.0%
proto/v1beta1/admin.pb.validate.go	0	22	0.0%
<!--	Total:	0	64	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
internal/api/v1beta1/billing_invoice.go	1	0.0%
<!--	Total:	1		-->

Totals
Change from base Build 10590915744:	-0.005%
Covered Lines:	10463
Relevant Lines:	110278

---

💛 - Coveralls