bug: light push response is empty when meta field is too large

[fryorcraken]

Problem

When js-waku client tries to use light push with a waku message that has large meta, nwaku sends an empty response back.

Expected: an error in the light push response to point towards the payload size issue.

Impact

To reproduce

If you can reproduce the behavior, steps to reproduce:

1. Start nwaku with light push
2. Send a light push rpc request that contains a large meta
3. get an empty rpc light push response

Expected behavior

rpc light push response contains:

is_success = false
info = "<error message about meta or field>"

Screenshots/logs

wakunode_Waku_Light_Push_[node_only]_Fails_to_push_message_with_large_meta.log

ERR 2023-09-21 02:20:22.908+00:00 failed to decode rpc                       topics="waku lightpush" tid=1 file=protocol.nim:43

nwaku version/commit hash

v0.19.0

[jm-clius]

Almost certainly closed by any fix for #1641

[fryorcraken]

Yes confirmed