Sort listed command names

[hugelgupf]

When just running ./bb or when using an unknown command, it will spit out a list of compiled commands. Sort it.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 59.01%. Comparing base (a274a8d) to head (df83888).

Files	Patch %	Lines
src/pkg/bb/bbmain/register.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
+ Coverage   58.52%   59.01%   +0.49%     
==========================================
  Files          16       15       -1     
  Lines        1068     1059       -9     
==========================================
  Hits          625      625              
+ Misses        443      434       -9     

Flag	Coverage Δ
1.20	82.91% <ø> (ø)
1.21.x	82.91% <ø> (ø)
1.22.x	59.01% <0.00%> (+0.49%)	⬆️

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