neovim: add 'autoconfigure' setting (#356271)

certain plugins need a custom configuration (available in passthru.initLua)
to work with nix. For instance unicode-vim needs to configure where to
find the data:
```
vim.g.Unicode_data_directory="${self.unicode-vim}/autoload/unicode"
```
if true, the wrapper automatically appends those snippets when necessary

first appearance of initLua in https://github.com/NixOS/nixpkgs/issues/352741

This will make testing those plugins easier.

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