[meta] Cut out dispatchers

[Hywan]

The Basic dispatcher is able to dispatch a request/task on several callables: function, closure, class+method, object+method…

The idea is to extract each one of these forms as a standalone dispatcher. Then, when they will be tested, we could introduce an Aggregate dispatcher. Finally, the Basic dispatcher would be a special usage of the Aggregate dispatcher that aggregates all the existing dispatchers.

The roadmap is:

• ensuring better performances for all dispatchers,
• ensuring better testability for all dispatchers,
• do not introduce BC break (not a lot at least, one is necessary, see incoming issues or PR),
• ensuring a better modularity by choosing/aggregating dispatchers.

Progress:

• Function (incl. Closure) dispatcher,
• ClassMethod dispatcher,
• ObjectMethod dispatcher,
• Aggregate dispatcher,
• Basic dispatcher.

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[Jir4]

👍