Initial support for configurable error handling

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Codecov Report

❌ Patch coverage is 36.90476% with 53 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.60%. Comparing base (53abfa0) to head (b9dbcc7).

Files with missing lines	Patch %	Lines
include/cpp_lmdb/error.hpp	0.00%	43 Missing ⚠️
include/cpp_lmdb/environment.hpp	66.66%	0 Missing and 5 partials ⚠️
include/cpp_lmdb/details/details.hpp	50.00%	0 Missing and 3 partials ⚠️
include/cpp_lmdb/transactions.hpp	90.00%	0 Missing and 2 partials ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
- Coverage   81.76%   72.60%   -9.17%     
==========================================
  Files           9        9              
  Lines         181      219      +38     
  Branches       27       20       -7     
==========================================
+ Hits          148      159      +11     
- Misses         12       46      +34     
+ Partials       21       14       -7     

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