Plugins definitions from package.json

[fcollonval]

References

Part of jupyterlab/lumino#601 for GSoC 2024 project

Code changes

• Bump lumino to use the new feature of providing a custom plugin registry
• Modify the plugin registry to deal with plugin definition from JSON (Token objects are not used any logger, only the Token.name matters)
• Make it possible to register a plugin without loading them and only load them at activation.
• Apply the new plugin definition on the csvviewer-extension
• Comment out the restoration of widgets for the csvviewer plugins as it is incompatible in its current implementation with the plugin data-based definition.

User-facing changes

Breaking the restoration of CSV/TSV widgets --> fine at first as this is part of a PoC and much more unknowns have to be addressed.

Backwards-incompatible changes

• the deactivation of plugins may not work as expected as it is impossible to know in advance if a plugin will have a deactivate method implemented.
• splice source is broken: can we drop it? I think yes as linking through file:// is a better yarn way of doing that TBC.

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