Declare spring-context as optional in web, webflux, messaging, jms [SPR-15733]

[spring-issuemaster]

Juergen Hoeller opened SPR-15733 and commented

spring-context is actually not required for web or messaging clients, and not for minimal functional server applications with WebFlux either. Let's consistently declare that dependency as optional so that it doesn't transitively appear in minimal scenarios.

Some existing consumers of spring-web and spring-jms may have to declare spring-context explicitly if needed, which shouldn't be too big a deal.

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Affects: 5.0 RC2

Referenced from: commits 1306bb9