LIU-385: Add support for SubGraphs in translator

[myxie]

This supports SubGraphs with no InputApps, which functionally ignores the entire SubGraph construct.

Logical Graph	Translated Graph

This does not address the functionality of sub-graphs with input apps, nor does it make any attempt to address the translation of those graphs; this may lead to undefined behaviour if a sub-graph with input apps is submitted for translation.

Summary by Sourcery

This pull request adds support for SubGraphs in the translator, specifically handling SubGraphs with no InputApps. It introduces a new property to identify SubGraph nodes and updates relevant functions to process these constructs.

• New Features:
  • Added support for SubGraphs in the translator, allowing SubGraphs with no InputApps to be processed.
• Enhancements:
  • Introduced a new property is_subgraph in lg_node.py to identify SubGraph nodes.
  • Updated convert_construct function in dm_utils.py to handle SubGraph constructs.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request adds support for SubGraphs in the translator, specifically handling SubGraphs with no InputApps. The changes ensure that SubGraphs are recognized and processed correctly, while ignoring the entire SubGraph construct if it has no InputApps. This update does not address the functionality of SubGraphs with InputApps, which may lead to undefined behavior if such SubGraphs are submitted for translation.

File-Level Changes

Files	Changes
daliuge-translator/dlg/dropmake/lg.py daliuge-translator/dlg/dropmake/dm_utils.py daliuge-translator/dlg/dropmake/lg_node.py daliuge-translator/dlg/dropmake/definition_classes.py	Added support for SubGraphs in the translator, including recognition and processing of SubGraphs with no InputApps.

[coveralls]

coverage: 79.626% (-0.03%) from 79.653% when pulling caa24e35237b49512445bfedebf8d67ae21a53c9 on LIU-385 into 22fb53d092c540c4af90c4fce45c929d2ed8e95a on master.