feat(sops): introduce sops plugin

plugins/sops/README.md

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+## Sops
+
+This plugin adds completion for [sops](https://github.com/scaleway/scaleway-cli), the simple and flexible tool for managing secrets.
+
+To use it, add `sops` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... sops)
+```

plugins/sops/sops.plugin.zsh

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+# Completion
+if (( ! $+commands[sops] )); then
+  return
+fi
+
+_sops() {
+  local -a opts
+  local cur
+  cur=${words[-1]}
+  if [[ "$cur" == "-"* ]]; then
+    opts=("${(@f)$(${words[@]:0:#words[@]-1} ${cur} --generate-shell-completion)}")
+  else
+    opts=("${(@f)$(${words[@]:0:#words[@]-1} --generate-shell-completion)}")
+  fi
+
+  if [[ "${opts[1]}" != "" ]]; then
+    _describe 'values' opts
+  else
+    _files
+  fi
+}
+
+compdef _sops sops