docs: added a service factory reference

[shahednasser]

Added a service factory reference of the generated methods and how to use them.

Since the types in the codebase are a bit complex, a generated reference won't provide a valuable result.

Instead, this reference is created manually and aims to cover common use cases, providing examples for them.

Closes DOCS-844

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[olivermrbl]

This is great @shahednasser – essentially, what I talked about the other day.

Minor nit and totally non-blocking: We could change customModuleService to postModuleService now that we are working with a post model.

[shahednasser]

@olivermrbl got point! Will make the change 👍🏻