BREAKING: Restrict proposed name in manifest

[Mrtenz]

This changes manifest validation to restrict the proposedName field to printable ASCII characters. This is a breaking change because previously any string (within a certain length) was allowed.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.44%. Comparing base (97144bf) to head (dccbdaf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2796   +/-   ##
=======================================
  Coverage   94.44%   94.44%           
=======================================
  Files         484      484           
  Lines       10308    10309    +1     
  Branches     1569     1569           
=======================================
+ Hits         9735     9736    +1     
  Misses        573      573           

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