Allow to add entries to context

[Xarthisius]

This pull request adds support for specifying extra JSON-LD vocabulary mappings (prefixes) via the --extra-context CLI option and corresponding programmatic APIs. It introduces new tests to ensure correct handling, serialization, round-tripping, and CLI integration of these extra context entries. The changes ensure that extra context mappings are always appended to the base context, are preserved across save/load operations, and are accessible both via the CLI and the Python interface.

CLI and API support for extra context:

• Added a new --extra-context (-c) CLI option to allow users to specify additional JSON-LD prefix-to-URI mappings (e.g., ex=http://example.org/), with validation to ensure correct format. This is integrated into the main CLI and relevant subcommands, and is also available via the TRO Python API. [1] [2] [3] [4] [5] [6] [7] [8]

Model and serialization changes:

• Extended the TransparentResearchObject model to include an extra_context field, ensuring that extra context entries are appended to the base @context during JSON-LD serialization, and are properly extracted when loading from JSON-LD. [1] [2] [3] [4]

Testing improvements:

• Added comprehensive tests for both the CLI and Python APIs to verify correct parsing, serialization, round-tripping, and help text for the new extra context functionality. Tests also ensure that the base context is always present and that multiple extra contexts are handled correctly. [1] [2]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.86%. Comparing base (62a93c0) to head (302a66c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   94.78%   94.86%   +0.07%     
==========================================
  Files          15       15              
  Lines        1035     1051      +16     
==========================================
+ Hits          981      997      +16     
  Misses         54       54              

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