feat(sspi): implement server-side Kerberos

[TheBestTvarynka]

Hi,
This PR contains server-side Kerberos implementation and the existing Kerberos client refactoring. See more details in these PRs:

• Refactoring part:
  • refactor(ffi): enable lints for unsafe code #430
  • refactor(sspi): Kerberos client implementation #435
• Implementation part:
  • test(sspi): implement simple KDC mock #429
  • feat(sspi): server-side Kebreros implementation #440
• Fixes:
  • feat(sspi): server-side Kerberos fixes #457
  • fix(sspi): Kerberos server MIC token generation and validation #464
  • fix(sspi): Kerberos server WRAP token generation and validation #463

The implementation was tested using FreeRDP and mstsc (with the help of MsRdpEx).

[CBenoit]

@TheBestTvarynka Could you change the commit type of feat(sspi): server-side Kerberos fixes to use fix instead? It will go in the wrong session of the changelog otherwise
Also feel free to adjust any other commit you may want to render differently in the changelog.

[TheBestTvarynka]

Could you change the commit type of feat(sspi): server-side Kerberos fixes to use fix instead?

sure. I will do it after I fix merge conflicts

[TheBestTvarynka]

@CBenoit I fixed the commit message and merge conflicts. Also, I performed a small dev-testing using FreeRDP just to make sure that I did not break anything during the bug fix. It still works:

So, you can review and merge this RP 😊

[CBenoit]

LGTM! Excellent job!!