feat: allow numbers in component names

[mr-cal]

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• Allows for digits in component names
• Refactor to use same validation for snap and component names
• Begin snap and component names errors with a lowercase character

Depends on canonical/craft-parts#790

Fixes LP#2069783
(CRAFT-3043)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.66%. Comparing base (011dd11) to head (5954426).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4945      +/-   ##
==========================================
+ Coverage   89.64%   89.66%   +0.01%     
==========================================
  Files         334      335       +1     
  Lines       22401    22458      +57     
==========================================
+ Hits        20082    20137      +55     
- Misses       2319     2321       +2     

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[mr-cal]

CI is failing because this reference is excluded here

[cmatsuoka]

The implementation seems good, but we should test valid component names using names containing numbers.