refactor(lsp): debounce timer per buf and unify with non-debounce (#17016)

Part of the `pending_change` closure in the `changetracking.prepare` was
a bit confusing because it has access to `bufnr` and `uri` but it could
actually contain pending changes batched for multiple buffers.

(We accounted for that by grouping `pending_changes` by a `uri`, but
it's not obvious what's going on)

This commit changes the approach to do everything per buffer to avoid
any ambiguity.

It also brings the debounce/no-debounce a bit closer together: The
only difference is now whether a timer is used or if it is triggered
immediately

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