CLI tests for logging flags (#3609)

## Issue Addressed
Adding CLI tests for logging flags: log-color and disable-log-timestamp
Which issue # does this PR address?
#3588 
## Proposed Changes
Add CLI tests for logging flags as described in #3588 
Please list or describe the changes introduced by this PR.
Added logger_config to client::Config as suggested. Implemented Default for LoggerConfig based on what was being done elsewhere in the repo. Created 2 tests for each flag addressed.
## Additional Info

Please provide any additional information. For example, future considerations
or information useful for reviewers.

testing/simulator/src/sync_sim.rs

@@ -48,9 +48,9 @@ fn syncing_sim(
     let mut env = EnvironmentBuilder::minimal()
         .initialize_logger(LoggerConfig {
             path: None,
-            debug_level: log_level,
-            logfile_debug_level: "debug",
-            log_format,
+            debug_level: String::from(log_level),
+            logfile_debug_level: String::from("debug"),
+            log_format: log_format.map(String::from),
             log_color: false,
             disable_log_timestamp: false,
             max_log_size: 0,