Add initial scripting_tool (#26066)

Just a basic implementation so we can start trying it out.

Release Notes:

- N/A

---------

Co-authored-by: Marshall <marshall@zed.dev>
Co-authored-by: Michael <michael@zed.dev>

crates/scripting_tool/src/sandbox_preamble.lua

@@ -0,0 +1,40 @@
+---@diagnostic disable: undefined-global
+
+-- Create a sandbox environment
+local sandbox = {}
+
+-- Allow access to standard libraries (safe subset)
+sandbox.string = string
+sandbox.table = table
+sandbox.math = math
+sandbox.print = sb_print
+sandbox.type = type
+sandbox.tostring = tostring
+sandbox.tonumber = tonumber
+sandbox.pairs = pairs
+sandbox.ipairs = ipairs
+sandbox.search = search
+
+-- Create a sandboxed version of LuaFileIO
+local io = {}
+
+-- File functions
+io.open = sb_io_open
+
+-- Add the sandboxed io library to the sandbox environment
+sandbox.io = io
+
+
+-- Load the script with the sandbox environment
+local user_script_fn, err = load(user_script, nil, "t", sandbox)
+
+if not user_script_fn then
+  error("Failed to load user script: " .. tostring(err))
+end
+
+-- Execute the user script within the sandbox
+local success, result = pcall(user_script_fn)
+
+if not success then
+  error("Error executing user script: " .. tostring(result))
+end