Extract a runtime-core extension

[ndr-brt]

Currently the "base core extension" is the connector-core, that gives the base services that are used for building a connector component, but there's no core module that can be used for a non-connector component build.

This eventual module will register the modules of connector-core that are not strictly dependent to the connector domain as:

• http client / retry policy
• type manager
• executor service container
• hostname
• event router
• ...

this module could be called runtime-core.

any thoughts?

[jimmarino]

We never got around to this with the module refactor a while back. It would be good to do this and also rebase the IH on this.