Filter messages over N bytes w/ error message about walrus

[w3b6x9]

@olirice thanks for creating this issue.

It would be great for devs to have access to the same message content, so they can surface the problem client-side to their users and diagnose the issue themselves. For example:

{
"type": "INSERT",
"schema": "public",
"table": "todos",
"columns": [
{
"name": "id",
"type": "int8",
},
{
"name": "details",
"type": "text",
},
{
"name": "user_id",
"type": "int8",
}
],
"commit_timestamp": "2021-09-29T17:35:38Z",
"record": null,
. "errors": ["changes surpass max size"]
}

Credit to @abc3 for bringing this up!