(assets): log asset size before publishing

### Description

Would be great to see the asset size in the log files.

https://github.com/aws/aws-cdk/blob/fd8e0e33816cb46678f7d1beac80b1623cdb6bac/packages/cdk-assets/lib/publishing.ts#L82-L84

### Use Case

Sometimes I want to see asset size increases / decreases and checked the logs assuming it would be reported. But it was not.

### Proposed Solution

Add both total bytes and human-readable sizes to the log.

https://github.com/aws/aws-cdk/blob/fd8e0e33816cb46678f7d1beac80b1623cdb6bac/packages/cdk-assets/lib/publishing.ts#L82-L84

### Other information

_No response_

### Acknowledge

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

Start at packages/cdk-assets/lib/publishing.ts lines 82-84, where the publishing log is emitted. Confirm how the asset size is available there, then make the log include both total bytes and a human-readable size. Done means asset size increases and decreases are visible in the publishing logs.

Written by the indexing model from the issue text.