Update module dependency graphs and add script to create them

[dturner]

What I have done and why

• Added new module dependency graphs for each module (displayed in README.md for each module) so it's easy to visualise module dependencies
• Created a script to regenerate module dependency graphs so it's easier to keep them up to date

To run the script, execute the following command in the project's root folder:

./generateModuleGraphs.sh --exclude-module :benchmarks --exclude-module :lint --exclude-module :ui-test-hilt-manifest

The --exclude-module parameter is used to exclude modules which don't appear in the root dependency graph (orphaned modules, only used by external programs, like CI or Android Studio)

Related issues/PRs:
#1088
#707

Future work

• Decide whether this should be integrated into CI, similar to screenshot tests and badging

Nice to haves:

• Add URLs to the images either to navigate between module graphs. Requires adding URLs for each node in the graph, which would be better done by modifying the plugin here, rather than hacking around with the .gv file it creates.
• Default size of SVGs seems quite small. Tried using dot -s for scaling but didn't work.

[jdkoren]

LGTM overall