spotify-player: add support for actions

[diniamo]

Description

Add support for configuring actions added in the new v0.19.1 release.

@repparw

Checklist

• Change is backwards compatible.

• Code formatted with ./format.

• Code tested through nix-shell --pure tests -A run.all or nix develop --ignore-environment .#all using Flakes.

• Test cases updated/added. See example.

• Commit messages are formatted like

  {component}: {description}
  
  {long description}
  

  See CONTRIBUTING for more information and recent commit messages for examples.

• If this PR adds a new module

  • Added myself as module maintainer. See example.

[repparw]

test failed, seems to be order of output in the file?
don't think is relevant for the program

[diniamo]

Society if CI only ran the relevant tests

[repparw]

@rycee can you have a look at this? Seems to be a quick merge I think