Add an action for Klein-Gordon CCE worldtube data communication

[Sizheng-Ma]

Proposed changes

This PR adds an action BoundaryComputeAndSendToEvolution<KleinGordonH5WorldtubeBoundary<Metavariables>, EvolutionComponent> to send worldtube data from the boundary component to the evolution component, together with two related unit tests.

Additionally, the action ReceiveWorldtubeData is hard-coded to take Metavariables::cce_boundary_communication_tags. In the first commit, I relax this assumption so that it can be used to treat Klein-Gordon data as well.

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Code review checklist

• The code is documented and the documentation renders correctly. Run
  make doc to generate the documentation locally into BUILD_DIR/docs/html.
  Then open index.html.
• The code follows the stylistic and code quality guidelines listed in the
  code review guide.
• The PR lists upgrade instructions and is labeled bugfix or
  new feature if appropriate.

Further comments

[knelli2]

Just one thing I noticed

[knelli2]

Looks good. You can squash

[Sizheng-Ma]

Done!