FDB-393 Add Wipe and Purge to C API (for pyfdb)

[ChrisspyB]

Note: I have also added some test coverage, but it is in pyfdb. I did not want to the tests in both C and python, especially since I do not anticpate anyone using fdb.wipe in C directly.

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📚 Documentation preview 📚: https://ecmwf-fdb--114.org.readthedocs.build/en/114/

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 70 lines in your changes missing coverage. Please review.

Project coverage is 63.57%. Comparing base (e0b97b2) to head (6e8b32d).
Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/fdb5/api/fdb_c.cc	0.00%	70 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #114      +/-   ##
===========================================
- Coverage    63.85%   63.57%   -0.29%     
===========================================
  Files          281      281              
  Lines        15817    15887      +70     
  Branches      1640     1640              
===========================================
  Hits         10100    10100              
- Misses        5717     5787      +70     

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