ECKIT-635 FAM Map data structure

[mcakircali]

Description

Map data structure on FAM (Fabric Attached Memory) via OpenFAM API

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 9.09091% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.71%. Comparing base (f210f7d) to head (5907c2b).

Files with missing lines	Patch %	Lines
src/eckit/exception/Exceptions.cc	0.00%	5 Missing ⚠️
src/eckit/net/Endpoint.cc	0.00%	3 Missing ⚠️
src/eckit/filesystem/URI.cc	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #209      +/-   ##
===========================================
- Coverage    65.74%   65.71%   -0.04%     
===========================================
  Files         1131     1131              
  Lines        57508    57518      +10     
  Branches      4332     4332              
===========================================
- Hits         37808    37796      -12     
- Misses       19700    19722      +22     

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