[1.0.0] Paging session limits / request ID validation / misc fixes.

[ChadSikorra]

A couple mostly misc fixes / guards:

• Adding a cap on paging sessions so it can't grow indefinitely by one client. Caps at 25. But it's configurable globally and with the normal per entry rules.
• Fixing message ID validation. My original read of the RFC was incorrect when I first implemented this long ago. It should only validate currently executing operations.
• Very minor adjustment to reject newlines in attribute use in PDO. This wasn't a security vector really, but should still be rejected.
• Fixes a read replica race condition on binds. The race condition was very very rare and discovered when I switched forwarding to occur much quicker in tests. Basically we need to re-read the current state of the entry before making a final "is it locked" decision due to sequencing. The alternative is to wrap the whole bind process in a locking transaction, which is a lot more effort for something that is very difficult to hit. I may revisit this.

[codecov]

Codecov Report

❌ Patch coverage is 92.06349% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.69%. Comparing base (87358c5) to head (97d3953).

Files with missing lines	Patch %	Lines
src/FreeDSx/Ldap/ServerOptions.php	66.66%	2 Missing ⚠️
...iner/Provider/ConnectionGraphContainerProvider.php	0.00%	1 Missing ⚠️
...ocol/ServerProtocolHandler/ServerPagingHandler.php	93.33%	1 Missing ⚠️
...dPolicy/Guard/BindStrategy/ReplicaBindStrategy.php	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #263   +/-   ##
=========================================
  Coverage     88.69%   88.69%           
- Complexity     6758     6769   +11     
=========================================
  Files           575      575           
  Lines         23350    23397   +47     
=========================================
+ Hits          20711    20753   +42     
- Misses         2639     2644    +5     

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