RISC-V parser for I instructions

Victor Dumitrescurequested to merge
vdum@riscv_parse into master

This MR adds the initial parse function for uncompressed instructions, initially for the base RV64I instructions. It introduces a type for parsed instructions and the ability to parse every uncompressed instruction format (R, I, S, B, U, J).

Manually testing the MR

cd src/risc_v/interpreter && cargo test parse
Edited by Victor Dumitrescu

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