Add an option for max PDU length.

[ChadSikorra]

Adding an option for max PDU length to prevent DoS style attacks in other libraries (LDAP specifically at the moment).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.13%. Comparing base (4690075) to head (cd597c9).

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #14      +/-   ##
============================================
+ Coverage     95.10%   95.13%   +0.03%     
- Complexity      379      382       +3     
============================================
  Files            24       24              
  Lines           961      967       +6     
============================================
+ Hits            914      920       +6     
  Misses           47       47              

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