DVX: 318: Added support for file upload and download using presigned URLs

[Aryamanz29]

Todos

• Add tests.
• Add docs.

Uploading file to the object store: 100% [==================================================] (20 MB/s) 
Downloading file from the object store: 100% [==================================================] (8.9 MB/s)

Sample snippet:

package main

import (
	"fmt"

	"github.com/atlanhq/atlan-go/atlan/assets"
	"github.com/atlanhq/atlan-go/atlan/model"
)

func main() {

	ctx := assets.NewContext()

	ctx.SetLogger(true, "debug")

	client := assets.NewFileClient(ctx)

	// fileName := "1GB_test_file"
	fileName := "atlan-go.png"
	tenantDir := "presigned-url-sdk-integration-tests"

	// Upload
	request := model.PresignedURLRequest{
		Key:    tenantDir + "/" + fileName,
		Expiry: "10s",
		Method: model.PUT,
	}

	url, _ := client.GeneratePresignedURL(&request)

	res, err := client.UploadFile(url, fileName)

	fmt.Println(res, err)

	/// Download
	request = model.PresignedURLRequest{
		Key:    tenantDir + "/" + fileName,
		Expiry: "10s",
		Method: model.GET,
	}

	url, _ = client.GeneratePresignedURL(&request)

	downloadFilePath := "download.png"

	err = client.DownloadFile(url, downloadFilePath)

	fmt.Println(res, err)
}