Add cs_regs_access support

[JimColerick]

Added support for the cs_regs_access function and implemented a corresponding struct to contain the data returned by the function.

Handles #63

[codecov[bot]]

Codecov Report

Merging #120 (27453ab) into master (fa37a37) will decrease coverage by 0.30%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #120      +/-   ##
==========================================
- Coverage   94.90%   94.59%   -0.31%     
==========================================
  Files          22       22              
  Lines        2670     2666       -4     
  Branches        0     2627    +2627     
==========================================
- Hits         2534     2522      -12     
- Misses        136      144       +8     

Impacted Files	Coverage Δ
capstone-rs/src/capstone.rs	93.52% <ø> (ø)
capstone-rs/src/instruction.rs	93.81% <ø> (ø)
capstone-rs/src/error.rs	59.52% <0.00%> (-5.48%)	:arrow_down:
capstone-rs/examples/parallel.rs	95.23% <0.00%> (-4.77%)	:arrow_down:
capstone-rs/examples/demo.rs	92.30% <0.00%> (-2.04%)	:arrow_down:
capstone-rs/src/arch/m680x.rs	95.93% <0.00%> (-0.74%)	:arrow_down:
capstone-rs/src/arch/riscv.rs	89.47% <0.00%> (-0.53%)	:arrow_down:
capstone-rs/src/constants.rs	78.82% <0.00%> (-0.49%)	:arrow_down:
capstone-rs/src/arch/sparc.rs	90.90% <0.00%> (-0.40%)	:arrow_down:
capstone-rs/src/arch/xcore.rs	92.00% <0.00%> (-0.31%)	:arrow_down:
... and 6 more

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[richo]

This looks good to me, but in truth I've been away from the project for a while 😅

I'm planning to wait for one of the more active folks to chime in