[1.0.0] Add an extensible storage backend system for the LDAP server.

[ChadSikorra]

First pass at an extensible storage backend system for the LDAP server. Supports simple file based / in-memory by default. Adds a Swoole based server as an optional dependency, so pcntl isn't the only way to run it. It's also needed to support an in-memory approach. Though the file approach should work for either.

I have purposefully avoided some kind of MySQL / other explicitly DB backed solution for now. I will create some docs with some major caveats. This should really only be used for development purposes. The server component was not meant for high load or anything substantial. It's quite limited in its LDAP capabilities, though it does support quite a lot now.

I also need to go through this quite a bit before it's ready.

Edit: This turned into a beast. I really had to refactor and refine a ton of things to get a pluggable backend working. So this is almost a complete reworking of the old way you'd extend the backend server component. But it's way more customizable now and things are split apart in a more sane way:

• Authentication is decoupled (and customizable -- noted in config).
• Bind name resolution is decoupled (and customizable -- noted in config).
• Storage adapter implementation is decoupled (file / json and in-memory support, but can implement your own).
• Backend interface system only needs to implement a few core methods now.
• Paging happens by default without needing to implement anything special.
• Added a SwooleServer based server runner in addition to the PCNTL based one.

[codecov]

Codecov Report

❌ Patch coverage is 74.77341% with 334 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.29%. Comparing base (668f8c2) to head (8566768).

Files with missing lines	Patch %	Lines
...Sx/Ldap/Server/ServerRunner/SwooleServerRunner.php	0.00%	81 Missing ⚠️
...ap/Server/ServerRunner/ServerRunnerLoggerTrait.php	0.00%	73 Missing ⚠️
...DSx/Ldap/Server/ServerRunner/PcntlServerRunner.php	0.00%	34 Missing ⚠️
...ver/Backend/Storage/Adapter/Lock/CoroutineLock.php	0.00%	29 Missing ⚠️
...Server/Backend/Storage/Adapter/JsonFileStorage.php	81.90%	19 Missing ⚠️
.../Server/Backend/Storage/WritableStorageBackend.php	89.21%	11 Missing ⚠️
...reeDSx/Ldap/Server/RequestHandler/ProxyBackend.php	83.33%	10 Missing ⚠️
src/FreeDSx/Ldap/Server/Backend/GenericBackend.php	0.00%	9 Missing ⚠️
...p/Server/Backend/Storage/Adapter/Lock/FileLock.php	76.31%	9 Missing ⚠️
...ocol/ServerProtocolHandler/ServerPagingHandler.php	92.15%	8 Missing ⚠️
... and 12 more

Additional details and impacted files

@@             Coverage Diff              @@
##                1.0      #96      +/-   ##
============================================
- Coverage     88.12%   86.29%   -1.83%     
- Complexity     2290     2600     +310     
============================================
  Files           174      196      +22     
  Lines          7225     8173     +948     
============================================
+ Hits           6367     7053     +686     
- Misses          858     1120     +262     

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