Improve Code Quality

[iamcarbon]

• Remove TypedStringAbstraction & eliminate reflection use (was only used by AttestationType)
• Update System.IdentityModel.Tokens.Jwt
• Use more shared error messages and update assertions

[iamcarbon]

@aseigler @abergs Ready for review.

[codecov-commenter]

Codecov Report

Merging #326 (0f6df43) into master (19c90bf) will increase coverage by 0.29%.
The diff coverage is 59.52%.

@@            Coverage Diff             @@
##           master     #326      +/-   ##
==========================================
+ Coverage   77.80%   78.09%   +0.29%     
==========================================
  Files          88       87       -1     
  Lines        2428     2433       +5     
  Branches      401      401              
==========================================
+ Hits         1889     1900      +11     
+ Misses        438      431       -7     
- Partials      101      102       +1     

Impacted Files	Coverage Δ
Src/Fido2/Objects/AttestationType.cs	45.16% <43.33%> (-54.84%)	⬇️
Src/Fido2/AttestationFormat/AndroidKey.cs	95.29% <100.00%> (ø)
Src/Fido2/AttestationFormat/Apple.cs	93.54% <100.00%> (ø)
Src/Fido2/AttestationFormat/Packed.cs	98.14% <100.00%> (ø)
Src/Fido2/AttestationFormat/Tpm.cs	99.64% <100.00%> (ø)
Src/Fido2/Fido2ErrorMessages.cs	100.00% <100.00%> (ø)
...rc/Fido2/Serialization/AttestationTypeConverter.cs	100.00% <100.00%> (ø)

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[abergs]

@iamcarbon Can you elaborate on the benefits of remving typedString?

[abergs]

@iamcarbon Good work. Will rebase & merge but would love to hear the reasoning of typedstring removal.