Back-end implementation for Uploading Avatars directly to S3

[nole2701]

Added functions in user.rs, query.rs, and queries.graphql to implement avatar uploading directly to S3.

AvatarUploader::new() - Creates an uploader instance with the aws_s3_sdk client using the env config and bucket name.

AvatarUploader::upload_avatar() - Generates a unique S3 key, determines the file type, and uses the S3 put_object function to upload it to S3. Returns the key such as user-uploaded-images/profile-images/user123/file123.png

AvatarUploader::key_to_url() - converts s3 keys to cloudfront URLs.

queries.rs upload_avatar()

• Takes in an input of image_data and file_name
• Validates the user is signed in
• Decodes the base64 image data
• Validates file size to 5MB for user avatars
• Creates an AvatarUploader instance and uses it to upload the file to S3.
• Convert the S3 key to a cloudfront URL and returns it.

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