Support "no signature" signers on local X.509 certificates.

[JonathanLennox]

As defined in draft-davidben-x509-alg-none.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 44.55%. Comparing base (84c7cba) to head (0249e9e).
Report is 137 commits behind head on master.

Files with missing lines	Patch %	Lines
...rm/src/main/kotlin/org/jitsi/nlj/dtls/DtlsUtils.kt	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2260      +/-   ##
============================================
- Coverage     45.55%   44.55%   -1.01%     
- Complexity     1972     2117     +145     
============================================
  Files           341      352      +11     
  Lines         18805    19809    +1004     
  Branches       2568     2686     +118     
============================================
+ Hits           8567     8825     +258     
- Misses         9372    10097     +725     
- Partials        866      887      +21     

Files with missing lines	Coverage Δ
...ain/kotlin/org/jitsi/nlj/dtls/AlgUnsignedSigner.kt	100.00% <100.00%> (ø)
...m/src/main/kotlin/org/jitsi/nlj/dtls/DtlsConfig.kt	97.29% <100.00%> (-2.71%)	⬇️
...rm/src/main/kotlin/org/jitsi/nlj/dtls/DtlsUtils.kt	56.09% <33.33%> (-2.31%)	⬇️

... and 188 files with indirect coverage changes

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