PLUME-67: multiple hook points

[antons-it]

Description

Support for calling plume from multiple points in the client code (hooks) - accounts for follow-up discussions after initial PR draft.

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 92.83388% with 44 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.19%. Comparing base (18b475c) to head (4545485).

Files with missing lines	Patch %	Lines
examples/example3.cc	0.00%	12 Missing ⚠️
src/plume/PluginHandler.cc	22.22%	7 Missing ⚠️
tests/core/hook_plugin.h	78.57%	6 Missing ⚠️
examples/example3.F90	0.00%	4 Missing ⚠️
src/plume/Protocol.cc	92.10%	3 Missing ⚠️
tests/core/hook_plugin_a.cc	80.00%	3 Missing ⚠️
src/plume/PluginConfig.h	90.47%	2 Missing ⚠️
examples/plugin_bar.cc	0.00%	1 Missing ⚠️
src/plume/Manager.cc	98.41%	1 Missing ⚠️
src/plume/Negotiator.cc	95.23%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #35      +/-   ##
===========================================
+ Coverage    71.24%   74.19%   +2.95%     
===========================================
  Files           92       97       +5     
  Lines         3912     4507     +595     
  Branches       348      380      +32     
===========================================
+ Hits          2787     3344     +557     
- Misses        1125     1163      +38     

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