Add gradle tasks to assist in code formatting

[jdaugherty]

Issue description

In the weekly 3/18 meeting, we discuss automatic code formatting and how many tools are insufficient with the current project configuration. It was discovered that intellij has a command line formatter. The proposal is 2 fold:

1. add a gradle task that invokes the command line formatter with the associated configuration to format target files
2. add git pre-hook scripts that one can install to invoke this automatically on changes files

[sanjana2505006]

Hello @jdaugherty, I've implemented the IntelliJ-based formatting as discussed in the issue. I've added a global formatCode task and a self-installing git hook so we can keep things consistent without much manual effort. Please let me know if you'd like any changes!