bug: logging to file resets lazy_load_blob

[nick1udwig]

Describe the bug
https://discord.com/channels/1186394868336038080/1306250401451999253

If you receive an HTTP request and log it (e.g. info!(); sending to println!() is fine) before reading the body with get_blob(), logging it to file will have replaced the blob. This happens because we Append to the log file, receiving a Result back from vfs, and hence, replacing our lazy_load_blob with None.

Code trace:

1. The file logger .append() call
2. What that .append() call does under the hood: Append and handle Response from vfs
3. lazy_load_blobs are thrown out when a new message is received

Expected behavior
Logging should not alter lazy_load_blob.

[nick1udwig]

https://discord.com/channels/1186394868336038080/1306250401451999253