Do not allow invalid tracker keys

[josecelano]

Do not allow invalid tracker keys. Keys cannot be constructed if they:

• Are longer than 32 chars.
• Contain non-alphanumeric ASCII chars.

[codecov]

Codecov Report

Attention: Patch coverage is 86.36364% with 3 lines in your changes missing coverage. Please review.

Project coverage is 77.41%. Comparing base (1f5de8c) to head (e81914b).

Files	Patch %	Lines
src/core/auth.rs	86.36%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #980      +/-   ##
===========================================
+ Coverage    77.40%   77.41%   +0.01%     
===========================================
  Files          184      184              
  Lines         9793     9812      +19     
===========================================
+ Hits          7580     7596      +16     
- Misses        2213     2216       +3     

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[josecelano]

ACK e81914b