breaking(go): refactored plugins, detached primitives from registry, refactored types

[apascal07]

Summary of changes:

• Tracer provider is now lazily instantiated when TracerProvider() is called instead of setting the state on each action.
• Primitives have had underlying types changed to embed ActionDef[In, Out, Stream] which allows them to inherit all methods from the base core.Action interface. This was necessary to allow a common interface to be returned from plugins and passed around between NewAction, DefineAction, and registry.RegisterAction. This is a non-breaking change since all APIs operate on the interfaces only, not the underlying type.
• Primitives now all have NewX functions that create a detached primitive which can then be registered with action.Register(registry).
• Plugins have been updated to the new plugin API which does not concern itself with the registry and only returns action instances.

Checklist (if applicable):

• PR title is following https://www.conventionalcommits.org/en/v1.0.0/
• Tested (manually, unit tested, etc.)
• Docs updated (updated docs or a docs bug required)

[huangjeff5]

Resources + MCP changes look good to me.

[huangjeff5]

Resources / MCP code changes LGTM