Feature Request: Add ECS Task Role Support

Description
The plugin currently supports EC2 Instance Roles but lacks support for ECS Task Roles.

Current Behavior

EC2 Instance Roles: Supported via http://169.254.169.254
ECS Task Roles: Not supported

Expected Behavior
Support ECS Task Roles by implementing the ECS metadata endpoint and credential retrieval.

Implementation Needed

Check for AWS_CONTAINER_CREDENTIALS_RELATIVE_URI environment variable

Add ECS metadata endpoint support: http://169.254.170.2

Extend EC2_Metadata_Service or create ECS_Metadata_Service

Use Case
Enable the plugin to work seamlessly in ECS Fargate/EC2 tasks with IAM Task Roles

Workaround
Currently requires manual credential injection via environment variables or custom filters.