Describe the low-level API

[griffinmilsap]

Adds description of low-level API and highlights examples described in ezmsg-org/ezmsg#215

[KonradPilch]

Great work Griffin!

[Copilot]

Pull request overview

This pull request adds comprehensive documentation for ezmsg's low-level API, explaining how it differs from the high-level API and when to use each. The new documentation page helps users understand the publish/subscribe messaging primitives that underlie ezmsg and provides guidance on choosing between the low-level and high-level APIs based on their use case.

Changes:

• Added a new explanation page documenting the low-level API architecture and use cases
• Updated the explanations table of contents to include the new low-level API documentation
• Added references to example scripts demonstrating low-level API usage in both synchronous and asynchronous styles

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
docs/source/explanations/low-level-api.rst	New documentation page explaining low-level API concepts, comparing it with high-level API, and providing guidance on choosing between them
docs/source/explanations/content-explanations.rst	Added low-level-api to the toctree to include it in the documentation structure

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