avoid custom CreationalContext and Contextual implementations in the TCK

[Ladicek]

On a small number of places, the CDI TCK creates its own implementations of CreationalContext and Contextual. These are extremely bare APIs that aren't sufficient for internal needs of CDI implementations or for interoperability. All CDI implementations that I know expose internally a much richer API and generally expect that their CreationalContext and Contextual implementations are used. It is possible to bend the implementations to accept a CreationalContext or Contextual of outside provenance, but I believe there's exactly nothing in the CDI specification that makes this mandatory.

Instead, I believe the CDI TCK should:

1. avoid using its own CreationalContext and Contextual implementations;
2. expose SPIs that lets implementations supply their own CreationalContext and Contextual implementations, augmented with inspection capabilities for the tests that need it.

This PR does exactly that.

[Ladicek]

Since this PR adds a new TCK SPI, this can only be done in the next major/minor CDI TCK version (4.1/5.0 I believe). Hence this is a draft for now.

[manovotn]

I've rebased this onto current master as two of the commits were overlapping with what we did in #463.

Also moving into ready for review state.
@Ladicek Is there anything you'd like to add/change WRT this PR? I already have a Weld side draft for this so I'd be fine to approve and merge this soon.

[Ladicek]

I actually have a few more things locally, to avoid custom Contextuals in addition to custom CreationalContexts. I'll rebase and force-push to this PR.

[Ladicek]

Rebased, added a commit that removes obsolete TCK exclusions, force-pushed, and updated the title and summary of this PR.

@manovotn my implementation of these SPIs for Weld is in https://github.com/Ladicek/weld-core/commits/new-tck-spi, feel free to steal that :-) I also have an implementation of these SPIs for ArC on a branch somewhere, I can dig that up if interested.

[manovotn]

@manovotn my implementation of these SPIs for Weld is in https://github.com/Ladicek/weld-core/commits/new-tck-spi, feel free to steal that :-) I also have an implementation of these SPIs for ArC on a branch somewhere, I can dig that up if interested.

Thanks but I already have my own draft.
Later today I'll add the Contextuals impl to it as well and once I get a pass, I will add a green stamp here.