Add kernel infrastructure to read RDT and assign RMIDs

[yonch]

Added a kernel module that:

• Generates a tracepoint on every CPU, synchronized to 1 millisecond boundaries
• Generates a tracepoint on every context switch
• Enumerates the CPU's RDT capabilities
• Can assign RMIDs
• Reads local and total memory bandwidth and LLC occupancy every 1 millisecond and generates a tracepoint

Added a script that captures these traces and performs a sanity check.

There's also a Github Actions to compile and sanity-test the module on an RDT-capable bare-metal instance on AWS