Fix: Avoid Hashed Labels in Registries

[adraffy]

• changed NameUtils.sol and added tests
  • added isHashedLabel()
  • added isValidLabel()
• changed PermissionedRegistry.register() to require isValidLabel() or revert error InvalidLabel()
• changed PermissionedRegistry.register() to revert error NameTooLong() if more than 255 bytes
• changed UniversalResolver.findResolver() to not traverse hashed labels
• changed ETHRegistrar.valid() to use NameUtils.isValidLabel() limit to 255 bytes
  • ran prettier
  • renamed name to label

[coveralls]

Pull Request Test Coverage Report for Build 16230255862

Details

• 54 of 54 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 68.254%

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Totals
Change from base Build 16184738850:	0.3%
Covered Lines:	935
Relevant Lines:	1311

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💛 - Coveralls

[adraffy]

Revisit this after RegistryUtils and related merges.