fix: [audit] ZNS-1, ZNS-2, vulnerability due to lack of string validation

[JamesEarle]

String validation now exists to only allow domain names to be alphanumeric characters that match [a-z0-9-]

By adding this, creating a single domain or subdomain with the name 0://wilder.2ld.3ld.4ld is not possible because the . character does not match this pattern. Any domain name that includes a ., a capital letter, or any special character like !()@#$%^&*? is not valid. We also no longer allow unicode characters for special things like emojis or letters with accent marks.

Validation function exists in StringUtils library

This addresses ZNS-1 in a way as well. Spoofing is still possible because people can mint domains like w1lder and wild3r which can't really stopped entirely unless we also disallow numbers. This change does, however, address capital letters and other possibly abusable special characters so domains like Wilder can't be created

[codecov]

Codecov Report

Merging #61 (5498344) into development (8f8bdff) will increase coverage by 0.00%.
The diff coverage is 99.49%.

Additional details and impacted files

@@             Coverage Diff              @@
##           development      #61   +/-   ##
============================================
  Coverage        99.79%   99.79%           
============================================
  Files               11       11           
  Lines              493      498    +5     
  Branches           123      124    +1     
============================================
+ Hits               492      497    +5     
  Misses               1        1           

[openzeppelin-code]

fix: [audit] ZNS-1, ZNS-2, vulnerability due to lack of string validation

Generated at commit: 54983448803d054a5807c4204e624a8075d2c90e

🚨 Vulnerabilities Summary

Process	Issues	Results
Contract Inspector	note low Total	21 5 26
Dependency Checker	Total	0

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For more details view the full report in OpenZeppelin Code

[zero-devops]

🎉 This PR is included in version 0.6.7 🎉

The release is available on GitHub release

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