add smart-paste plugin from the docs (#107)

Co-authored-by: sxyazi <sxyazi@gmail.com>

smart-paste.yazi/LICENSE

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+../LICENSE

smart-paste.yazi/README.md

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+# smart-paste.yazi
+
+Paste files into the hovered directory or to the CWD if hovering over a file.
+
+https://github.com/user-attachments/assets/b3f6348e-abbe-42fe-9a67-a96e68f11255
+
+## Installation
+
+```sh
+ya pack -a yazi-rs/plugins:smart-paste
+```
+
+## Usage
+
+Add this to your `~/.config/yazi/keymap.toml`:
+
+```toml
+[[manager.prepend_keymap]]
+on   = "p"
+run  = "plugin smart-paste"
+desc = "Paste into the hovered directory or CWD"
+```
+
+## License
+
+This plugin is MIT-licensed. For more information check the [LICENSE](LICENSE) file.

smart-paste.yazi/main.lua

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+--- @sync entry
+return {
+	entry = function()
+		local h = cx.active.current.hovered
+		if h and h.cha.is_dir then
+			ya.mgr_emit("enter", {})
+			ya.mgr_emit("paste", {})
+			ya.mgr_emit("leave", {})
+		else
+			ya.mgr_emit("paste", {})
+		end
+	end,
+}