Add structured logging

[nahsra]

Here's a snapshot of output. I do include a framework-specific timestamp field that I think we'll want to add eventually.

$ ./gradlew :core-codemods:run --args='--output /tmp/dvja.codetf --verbose --dry-run --project-name WebGoat --log-rmat json /tmp/dvja'

{"timestamp":"2023-10-10T12:46:10.113002-04:00","message":"","level":"DEBUG","project_name":"WebGoat","file":"Logs.java","line":23}
{"timestamp":"2023-10-10T12:46:10.121251-04:00","message":"[starting]","level":"DEBUG","project_name":"WebGoat","file":"Logs.java","line":24}
{"timestamp":"2023-10-10T12:46:10.122303-04:00","message":"codemodder: java/0.67.9-SNAPSHOT","level":"INFO","project_name":"WebGoat","file":"CLI.java","line":253}
{"timestamp":"2023-10-10T12:46:10.124168-04:00","message":"","level":"DEBUG","project_name":"WebGoat","file":"Logs.java","line":23}
{"timestamp":"2023-10-10T12:46:10.1243-04:00","message":"[setup]","level":"DEBUG","project_name":"WebGoat","file":"Logs.java","line":24}
{"timestamp":"2023-10-10T12:46:10.138269-04:00","message":"dry run temporary directory: /var/folders/3n/_gqxkk5j6bd07m75_2s100wm0000gn/T/codemodder-project3203299650741969179","level":"DEBUG","project_name":"WebGoat","file":"CLI.java","line":284}
{"timestamp":"2023-10-10T12:46:10.342354-04:00","message":"dry run copy finished: 204ms","level":"DEBUG","project_name":"WebGoat","file":"CLI.java","line":288}

... and again without project_name:

{"timestamp":"2023-10-10T12:49:22.432909-04:00","message":"","level":"DEBUG","file":"Logs.java","line":23}
{"timestamp":"2023-10-10T12:49:22.444855-04:00","message":"[starting]","level":"DEBUG","file":"Logs.java","line":24}
{"timestamp":"2023-10-10T12:49:22.447171-04:00","message":"codemodder: java/0.67.9-SNAPSHOT","level":"INFO","file":"CLI.java","line":250}
{"timestamp":"2023-10-10T12:49:22.448285-04:00","message":"","level":"DEBUG","file":"Logs.java","line":23}
{"timestamp":"2023-10-10T12:49:22.448625-04:00","message":"[setup]","level":"DEBUG","file":"Logs.java","line":24}