Make backtrace logging configurable: pretty-printed or logged

[jbearer]

Adds an option to log panics via the tracing formatter, so they can be parsed and interpeted by Datadog. If RUST_LOG_FORMAT=json is not set, panics will be pretty-printed directly to standard out, as they have been until now.

This PR:

• Makes logging configurable via env var/CLI
• Chooses which panic handler to install based on RUST_LOG_FORMAT

Key places to review:

• utils/src/logging.rs has the logging setup code and config parameters
• deleted utility program count-transactions as the query service now has this functionality
• all other changes are just replacing

  setup_logging();
  setup_backtrace();

  with either logging::Config::init (for main binaries, to get the config from the command line) or setup_test

Things tested

• demo-native works
• manually forcing a panic gives correct output based on the env
• git grep setup_logging and git grep setup_backtrace have no results outside the logging utils

[Ancient123]

I think it would be cleaner to just use the value in RUST_LOG_FORMAT which we have to set to json in order to enable json logging output right now anyways.

[jbearer]

Done in 2982c72

[imabdulbasit]

LGTM