feat: allow the application to choose the help order of commands

[lengau]

fixes #195

• [x] Have you followed the guidelines for contributing?
• [x] Have you signed the CLA?
• [x] Have you successfully run tox?

[codecov[bot]]

Codecov Report

Merging #196 (1628ccf) into main (19f933e) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #196      +/-   ##
==========================================
+ Coverage   94.70%   94.73%   +0.02%     
==========================================
  Files           7        7              
  Lines        1058     1063       +5     
  Branches      193      194       +1     
==========================================
+ Hits         1002     1007       +5     
  Misses         53       53              
  Partials        3        3              

Files	Coverage Δ
craft_cli/dispatcher.py	99.15% <100.00%> (+<0.01%)	:arrow_up:
craft_cli/helptexts.py	98.05% <100.00%> (+0.03%)	:arrow_up:

[sergiusens]

your commit message needs to be shorter ;-)