resource/lambda_function: Enhance plan-time validation

[gdavison]

Description

As the Lambda function resource has been extended and new plan-time validation options have been added to the Terraform Plugin SDK we have some validation gaps that can now be closed.

• Replace ConflictsWith on s3_bucket, s3_key, s3_object_version, image_uri, and filename with ExactlyOneOf and add RequiredWith: []string{"s3_key"} on s3_bucket
• Add ConflictsWith: []string{"filename", "s3_bucket", "s3_key", "s3_object_version"} to image_config
• Add cross-attribute validation using the schema.Resource field CustomizeDiff to ensure that the value of package_type and the values of s3_bucket, s3_key, s3_object_version, image_uri, image_config, and filename are appropriate

This may not be an exhaustive list of validations.

Affected Resource

• aws_lambda_function

References

• Add lambda container image support #16512 (comment)
• Add lambda container image support #16512 (comment)
• Add lambda container image support #16512 (comment)

[bnusunny]

@gdavison I will work on this.

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