Implement Linode Interface data source

[zliang-akamai]

📝 Description

Add Linode Interface data source

✔️ How to Test

TF_ACC=1 go test --tags="integration" -v ./linode/linodeinterface -run TestAccDataSourceLinodeInterface_basic

[Copilot]

Pull Request Overview

This PR implements a new Linode Interface data source that allows users to query information about Linode network interfaces. The data source supports retrieving details about public, VLAN, and VPC interfaces including their IPv4/IPv6 configurations and routing information.

• Adds comprehensive schema definitions for interface types (public, VLAN, VPC)
• Implements data models and flattening logic for all interface configurations
• Includes test coverage with Terraform configuration templates

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
linode/linodeinterface/tmpl/template.go	Adds template function for generating basic data source test configuration
linode/linodeinterface/tmpl/datasource_basic.gotf	Terraform template for testing data source with instance and interface resources
linode/linodeinterface/framework_datasource_test.go	Integration test for the data source with basic functionality checks
linode/linodeinterface/framework_datasource_schema.go	Schema definitions for all interface types and their nested attributes
linode/linodeinterface/framework_datasource_models.go	Data models and flattening logic for converting API responses to Terraform state
linode/linodeinterface/framework_datasource.go	Main data source implementation with read logic and API client interaction
linode/framework_provider.go	Registers the new data source with the provider

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[lgarber-akamai]

LGTM other than the comments posted by Copilot. Nice work!