Refactor - BuiltInProgram::register_function()

[Lichtso]

• Renames register_function_by_name() => register_function().
• Makes register_function() take &[u8] instead of &str.

[codecov-commenter]

Codecov Report

Merging #457 (06cdde0) into main (44487c3) will not change coverage.
The diff coverage is 80.00%.

@@           Coverage Diff           @@
##             main     #457   +/-   ##
=======================================
  Coverage   90.47%   90.47%           
=======================================
  Files          23       23           
  Lines        9943     9943           
=======================================
  Hits         8996     8996           
  Misses        947      947           

Impacted Files	Coverage Δ
src/disassembler.rs	93.33% <0.00%> (ø)
src/static_analysis.rs	66.31% <0.00%> (ø)
src/elf.rs	91.21% <100.00%> (ø)
src/jit.rs	94.06% <100.00%> (ø)
src/vm.rs	75.67% <100.00%> (ø)

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