Fix log output

[mircea-c]

Current JSON logs emitted by nomic binary look like this:

! {"_msg":"executed block","height":11401057,"level":"info","module":"state","num_invalid_txs":0,"num_valid_txs":0,"ts":"2023-12-08T19:26:53.538126559Z"}

! {"_msg":"committed state","app_hash":"ABA390CCF6C431BFE27D8D7E809876CD22ECFA2C1F0730E659D21FFDD3E7A3D5","height":11401057,"level":"info","module":"state","num_txs":0,"ts":"2023-12-08T19:26:53.586123472Z"}

! {"_msg":"indexed block exents","height":11401057,"level":"info","module":"txindex","ts":"2023-12-08T19:26:53.586793819Z"}

The extra ! and newline in between every log line don't seem to serve any actual purpose and are absolute nightmares to deal with when trying to ingest logs in any sort of centralized log storage.

Please fix the logging system to remove these unnecessary characters.