feat(filesystem): add BEFORE_FILE_{ADD/DELETE} events

[pynappo]

Closes #1276

Pinging @igorlfs and @mehalter - does anything needs a change? the LSP says only the URIs need to be passed in so I'm just passing the filenames over.

[mehalter]

This looks great! One thing I noticed is you are returning immediately after if the event returns that the operation was handled. This seems like a good idea since it gives the user control over the add/delete, but should we also trigger the after events as well just in case the user has added custom events for that?

[igorlfs]

Hey there! I think you meant to ping @antosha417, the original author of nvim-lsp-file-operations? I only have a fork with some (very) minor changes

[pynappo]

This looks great! One thing I noticed is you are returning immediately after if the event returns that the operation was handled. This seems like a good idea since it gives the user control over the add/delete, but should we also trigger the after events as well just in case the user has added custom events for that?

I think it makes sense, although the other BEFORE events will need to be updated as well.

Hey there! I think you meant to ping @antosha417, the original author of nvim-lsp-file-operations? I only have a fork with some (very) minor changes

Yeah i meant to ping them instead, apologies.