Apply a default pagination on IS List RPCs if not provided in the request

[KrishnaIyer]

Summary

Apply a default pagination on IS List RPCs if not provided in the request.

Steps to Reproduce

1. List end devices in an application or all gateways of a user.
2. Don't set the Limit field of the request.

Current Result

Currently limit value of 0 returns all entries.

Expected Result

We should use a default value and use that when the limit in the request is not set.

Relevant Logs

No response

URL

No response

Deployment

The Things Stack Cloud

The Things Stack Version

3.32.1

Client Name and Version

No response

Other Information

No response

Proposed Fix

• Define a flag in the identity server configuration to set default pagination.

	Pagination     struct {
		DefaultLimit int64 `name:"default-limit" description:"The default limit applied to paginated requests if not specified"`
	} `name:"pagination" description:"Pagination settings"`

• Set the default to 10: https://github.com/TheThingsNetwork/lorawan-stack/blob/v3.32/cmd/internal/shared/identityserver/config.go#L28
• In WithPagination, use this default value if req.Limit is not set. https://github.com/TheThingsNetwork/lorawan-stack/blob/v3.32/pkg/identityserver/store/pagination.go#L36

Contributing

• I can help by doing more research.
• I can help by implementing a fix after the proposal above is approved.
• I can help by testing the fix before it's released.

Validation

• The fix is tested in a staging environment.
• The fix is documented in The Things Stack Documentation

Code of Conduct

• I agree to follow TTN's Community Code of Conduct.

[KrishnaIyer]

This is tested and being rolled out.