ssa: PyVal support py bytes

[visualfc]

a := py.List([...]byte{1, 2, 3}, [0]byte{})
std.Print(a) // [b'\x01\x02\x03', b'']

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.96%. Comparing base (d8da436) to head (36fa18b).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1198      +/-   ##
==========================================
+ Coverage   87.93%   87.96%   +0.02%     
==========================================
  Files          29       29              
  Lines        7404     7419      +15     
==========================================
+ Hits         6511     6526      +15     
  Misses        825      825              
  Partials       68       68              

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