[FEATURE] Allow s3Location as Document and Image Source

[ctoh-skechers]

Problem Statement

Since Bedrock supports s3Location as an document/image source, please allow Strands SDK to also support that.

	"messages": [
		{
			"document": {
				"name": "file",
				"format": "docx",
				"source": {
					"s3Location": {
						"uri": "s3://......"
					}
				}
			}
		},
		{
			"text": "summarize this document please"
		}
	]

Proposed Solution

No response

Use Case

This is needed to allow the ability to have large files in context for certain models

Alternatives Solutions

No response

Additional Context

No response