fix(ssh): config option to pass extra args to SCP (#340)

* Adding in SCP options configuration

This changeset adds in additional SCP options to the config. This allows
the user to specify a list of flags to send to the SCP command that will
be expanded into each shell command.

The primary driver for this is from newe boxes SSHing into pre 9 openSSH
boxes. New openSSH uses sftp server under the hood, rather than the
older SCP protocol. If you go into a system that does not have these
changes, SCP fails to work. The '-O' command line flag was introduced to
resolve this.

Using this change, the user can now pass in `extra_scp_options = {"-O"}`
to resolve the issue.

* Replacing table.unpack with global unpack

* lint: apply stylua

* refactor: change option name and shuffle config around

---------

Co-authored-by: Eric Guinn <eric_guinn@selinc.com>
Co-authored-by: Steven Arcangeli <stevearc@stevearc.com>

README.md

@@ -199,10 +199,6 @@ require("oil").setup({
     ["g."] = "actions.toggle_hidden",
     ["g\\"] = "actions.toggle_trash",
   },
-  -- Configuration for the floating keymaps help window
-  keymaps_help = {
-    border = "rounded",
-  },
   -- Set to false to disable all of the above keymaps
   use_default_keymaps = true,
   view_options = {
@@ -226,6 +222,8 @@ require("oil").setup({
       { "name", "asc" },
     },
   },
+  -- Extra arguments to pass to SCP when moving/copying files over SSH
+  extra_scp_args = {},
   -- EXPERIMENTAL support for performing file operations with git
   git = {
     -- Return true to automatically git add/mv/rm files
@@ -298,6 +296,10 @@ require("oil").setup({
   ssh = {
     border = "rounded",
   },
+  -- Configuration for the floating keymaps help window
+  keymaps_help = {
+    border = "rounded",
+  },
 })
 ```