Hoist address decode and continuation label logic into functions
Hoist address decode and continuation label logic into functions

- Add continuation label logic to decode_pair
- Move address decode and labels for jumps and branches into decode_jumps

Example command to print label, continuation and address decode:

./build/darwin_x86_64/bin/riscv-compress-elf -y -c test/hello-world-libc

rv8-io/rv8,rv8-io/rv8,rv8-io/rv8