Switch the following pickers to use the native neovim lsp handler
functions using the `on_list` option:
- `references` -> `vim.lsp.buf.references`
- `definitions` -> `vim.lsp.buf.definition`
- `type_definitions` -> `vim.lsp.buf.type_definition`
- `implementations` -> `vim.lsp.buf.implementation`
This offloads the request and response handling off the neovim. This
also let's responses pass through any custom handlers registered via
`vim.lsp.handlers`.
This only affects users on neovim 0.11+. The `on_list` option was
introduced in nvim 0.10 but only recently in 0.11, has neovim's
`vim.lsp.buf.*` functions added improved support for responses from
multiple language servers.
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