Add Throttle Sim Mode

[rafguevara14]

Summary

This PR adds the ability to receive APPS 1 and 2 values via an encoding scheme through UART as defined here.
https://docs.google.com/document/d/1JWH6s5qf8QeWGzkVzae5GWXK8BNsT8EGFw0WuFVnmiY/edit

This functionality will then be used in conjunction with @kevinl03 's python scripts to fully simulate deal values in real-time and get real throttle output from the VCU. More details can be found in the VCU User Manual...A test file written in python is also added that sends arbitrary values with known VCU responses to test that the VCU is actually processing and outputting data as expected.

TODO:

• Create VCU User Manual

Misc features

• New build config in CCS for sim and normal mode
• All compiler optimizations removed for ease of debugging
• More useful print statements (tells you when in sim mode, spams terminal if throttle task not initialized properly)

Spinoff Issues

Here are some other features and TODOs added that are outside the scope of this PR. These need to be planned out and prioritized accordingly @kkramer215
#36
#37
#38

[kkramer215]

LGTM

[kevinl03]

LGTM