feat: add benchmark tools and fixed downloading

[gaius-qi]

Description

This pull request introduces several significant changes to the benchmark package, focusing on enhancing the file server setup, improving the dragonfly benchmark process, and incorporating a new UUID dependency. The most important changes are grouped by theme below:

File Server Setup:

• Makefile: Added a new docker-build-file-server target to build the file server image and updated the help section accordingly.
• Dockerfile: Created a new Dockerfile for the file server, which uses an nginx:alpine base image and generates various file sizes for benchmarking.
• file-server.yaml: Added a new Kubernetes configuration file for the file server, defining a Service and a StatefulSet for deployment.

Dragonfly Benchmark Improvements:

• dragonfly.go: Added a Cleanup method to the Dragonfly interface and its implementation to clean up downloaded files after benchmarks. [1] [2]
• dragonfly.go: Improved the downloadFileByDfget and downloadFileByProxy methods to use a new getOutput method for generating output paths. [1] [2]

Logging Enhancements:

• dragonfly.go: Added additional logging to indicate the completion of benchmarks and cleanup processes. [1] [2]

Dependency Updates:

• go.mod: Added github.com/google/uuid as a new dependency.
• file_server.go: Updated the file URL generation to include a UUID query parameter.

These changes collectively improve the benchmarking process by adding better logging, cleanup functionality, and a more robust file server setup.

Related Issue

Motivation and Context

[Heatherchan2]

LGTM