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>

doc/oil.txt

@@ -90,10 +90,6 @@ CONFIG                                                                *oil-confi
         ["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 = {
@@ -117,6 +113,8 @@ CONFIG                                                                *oil-confi
           { "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
@@ -189,6 +187,10 @@ CONFIG                                                                *oil-confi
       ssh = {
         border = "rounded",
       },
+      -- Configuration for the floating keymaps help window
+      keymaps_help = {
+        border = "rounded",
+      },
     })
 <