[1.0.0] Add a SaslInterface.

[ChadSikorra]

Adding this to help ease implementation of it in the LDAP library.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.24%. Comparing base (888f3d1) to head (962860d).

Additional details and impacted files

@@            Coverage Diff            @@
##               main       #9   +/-   ##
=========================================
  Coverage     78.24%   78.24%           
  Complexity      521      521           
=========================================
  Files            35       35           
  Lines          1531     1531           
=========================================
  Hits           1198     1198           
  Misses          333      333           

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