Allow deploying to encrypted s3 folders

Our company policy is that code deployments must be uploaded to a specific S3 bucket, which enforces encryption. In our dev account, we occasionally deploy lambdas and stacks via the AWS tools using visual studio / cli lambda tools.

Since encryption was enabled in S3, these manual deployments fail with error
`Error uploading to {path} in bucket {bucket}: Invalid keyId aws/s3`
There does not appear to be any way to allow enable this in `aws-lambda-tools-defaults.json` or elsewhere.

**Version**: Amazon Lambda Tools for .NET Core applications (3.2.3)

**To Reproduce**:
1. Create an S3 bucket manually and set encryption to AES256 or KMS
2. Create a AWS Serverless Application and set it up to deploy to the bucket
3. Deploy the function via AWS for Visual Studio or `dotnet lambda deploy-function`

It appears that Utilities.UploadToS3Async() needs to be changed to allow `ServerSideEncryptionMethod` and associated properties to be set in the PutObjectRequest, then passed through from `dotnet lambda deploy-function` and be configurable in `aws-lambda-tools-defaults.json`

Start by tracing Utilities.UploadToS3Async() and the dotnet lambda deploy-function entry point, then inspect how aws-lambda-tools-defaults.json settings reach the PutObjectRequest. Done means deployments can configure the requested S3 server-side encryption method and related properties for both AES256 and KMS buckets, and the documented reproduction succeeds.

Written by the indexing model from the issue text.