Replace Boost.python with pybind11

[marcosbento]

Description

Replace Boost.python with pybind11

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 93.62018% with 86 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.72%. Comparing base (78dbae2) to head (430b8b7).

Files with missing lines	Patch %	Lines
libs/pyext/src/ecflow/python/ExportClient.cpp	89.21%	26 Missing ⚠️
libs/pyext/src/ecflow/python/ExportNode.cpp	94.71%	16 Missing ⚠️
libs/pyext/src/ecflow/python/ExportNodeAttr.cpp	96.21%	14 Missing ⚠️
libs/pyext/src/ecflow/python/NodeUtil.cpp	89.00%	11 Missing ⚠️
libs/pyext/src/ecflow/python/PythonUtil.cpp	81.25%	6 Missing ⚠️
libs/attribute/src/ecflow/attribute/CronAttr.hpp	0.00%	4 Missing ⚠️
libs/pyext/src/ecflow/python/ExportDefs.cpp	96.15%	4 Missing ⚠️
libs/pyext/src/ecflow/python/NodeAttrDoc.cpp	80.00%	2 Missing ⚠️
libs/pyext/src/ecflow/python/PythonBinding.hpp	77.77%	2 Missing ⚠️
libs/pyext/src/ecflow/python/ExportTask.cpp	96.55%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #269      +/-   ##
===========================================
+ Coverage    49.63%   49.72%   +0.09%     
===========================================
  Files         1237     1239       +2     
  Lines        97566    97757     +191     
  Branches     14833    14827       -6     
===========================================
+ Hits         48423    48609     +186     
- Misses       49143    49148       +5     

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