refactor!: move container options to shared containers key

[tristan-f-r]

Closes #297. [See #297 for extra motivation of the containers key beyond the diamond dependency reason below]

This is 1/2 PRs being extracted from #329 to make it easier to add testing to dsub. The second PR is #390. (See the note after the horizontal break)

[See the diff without whitespace changes from config indentation]

I've avoided splitting this PR up before since the extra file is motivated by #329: specifically, we move ContainerSettings to container_schema.py instead of keeping it in schema.py to prevent the future dependency diamond of:

• containers.py depends on the schema for getting extra container settings (the follow-up PR above is going to refine containers.py's dependency on the schema by specifically only making it depend on container_schema.py)
• [algorithm].py, because of run_containers, depends on containers.py
• schema.py will, thanks to feat!: typed PRA#run #329, depend on [algorithm].py for all algorithms.

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I want to be able to pass a more rich suite of options to run_container_dsub (specifically, local, to specify that dsub should be mocked with docker as specified in dsub's documentation), which causes a strange dsub_local parameter to be propagated up all the way to run_container. Instead of adding this parameter or making an auxiliary object to pass both parameters in, it seemed better to reuse the object we were reading out of the global config anyway (we do this all over containers.py anyway for container parameters, so it might be better overall to pass them in as a parameter).

[agitter]

The contributing guide will also need updates.

[read-the-docs-community]

Documentation build overview

📚 spras | 🛠️ Build #30059909 | 📁 Comparing 9eb8c90 against latest (615e6fb)

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Show files changed (6 files in total): 📝 6 modified | ➕ 0 added | ➖ 0 deleted

File	Status
genindex.html	📝 modified
htcondor.html	📝 modified
contributing/index.html	📝 modified
fordevs/spras.config.html	📝 modified
fordevs/spras.html	📝 modified
tutorial/advanced.html	📝 modified

[tristan-f-r]

3cadfc4 was the only change necessary in contributing.rst to the best of my knowledge.

[tristan-f-r]

This has been tagged with tuning because it is a dependency of #321.

[agitter]

It looks like previous review comments were addressed.

The hash_level usage is still unintuitive to me, but I trust it will make more sense once I see the future changes.