Change AuthenticatorSelection.Default ResidentKey from discouraged to Preferred

[abergs]

This change aims to help the consumers move towards discoverable passkeys instead of defaulting to non-resident/2fa type of credentials.

This resolves #561.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.93%. Comparing base (94f6071) to head (712da67).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
Src/Fido2.Models/CredentialCreateOptions.cs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #563   +/-   ##
=======================================
  Coverage   76.93%   76.93%           
=======================================
  Files         100      100           
  Lines        2627     2627           
  Branches      441      441           
=======================================
  Hits         2021     2021           
  Misses        498      498           
  Partials      108      108           

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