[WIP]: Remove DummyContext

[tbkr]

Description

This is a WIP branch to get rid of the context in all of the expansion methods. The call tree relied on a DummyContext object being passed through several layers of the Code. There was no usage in the inner functions, rendering the object useless. I removed it form the function definitions.

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.

[tbkr]

Waiting for the CICD to see whether parts of the stack were relying on the functionality (I only checked the mars-client-bundle so far).

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.91608% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.42%. Comparing base (17e4fca) to head (f161ff8).

Files with missing lines	Patch %	Lines
src/metkit/mars/MarsExpansion.cc	35.29%	11 Missing ⚠️
src/metkit/mars/Type.cc	69.23%	4 Missing ⚠️
src/metkit/mars/MarsParsedRequest.cc	25.00%	3 Missing ⚠️
src/metkit/mars/MarsExpansion.h	0.00%	1 Missing ⚠️
src/metkit/mars/MarsLanguage.cc	92.85%	1 Missing ⚠️
src/metkit/mars/MarsParser.cc	50.00%	1 Missing ⚠️
src/metkit/mars/Parameter.cc	0.00%	1 Missing ⚠️
src/metkit/mars/TypeParam.cc	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #106      +/-   ##
===========================================
+ Coverage    70.12%   70.42%   +0.30%     
===========================================
  Files          135      134       -1     
  Lines         8143     8166      +23     
  Branches       780      779       -1     
===========================================
+ Hits          5710     5751      +41     
+ Misses        2433     2415      -18     

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[simondsmart]

I'd like to have a chat with you/Emanuele about this one. I think I would have to do a lot of reading before I could review it on-spec.