Expand jsonld context in load_resource_graph_from_source

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 75.70%. Comparing base (a6069a4) to head (fa01231).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #401 +/- ## ======================================= Coverage 75.70% 75.70% ======================================= Files 103 103 Lines 6751 6751 ======================================= Hits 5111 5111 Misses 1640 1640 ``` | [Flag](https://app.codecov.io/gh/BlueBrain/nexus-forge/pull/401/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/BlueBrain/nexus-forge/pull/401/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain) | `75.70% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain#carryforward-flags-in-the-pull-request-comment) to find out more.

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