DPL: move writers to plugin

[ktf]

This will allow us at some point to remove the dependency on TTree in the framework,
hopefully saving memory and allowing us to more easily customize the writing backend.

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI for 3db2528 at 2024-11-13 19:45:

## sw/BUILD/O2-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'

Full log here.

[ktf]

Tested on hyperloop as well as on my box. Merging.