[perf] : cache compiled Lua FunctionProto in RunScript to avoid redundant parse+compile on every call

**What would you like to be added**: Cache compiled Lua `FunctionProto` in the VM so scripts are parsed and compiled only once instead of on every `RunScript` call. Right now `RunScript` calls `l.DoString(script)` every single invocation even though the script never changes for a given customization. The fix is to compile once, store in a `sync.Map` keyed by script content, and reuse via `NewFunctionFromProto` + `PCall`. Behavior stays identical. Benchmarked the isolated parse+compile cost: | | ns/op | B/op | allocs/op | |---|---|---|---| | `DoString` (current) | 108,936 | 63,240 | 393 | | Cached proto | 1,827 | 2,888 | 10 | File: `pkg/resourceinterpreter/customized/declarative/luavm/lua.go` :- `RunScript()` --- **Why is this needed**: `RunScript` is called on every status event through `ReflectStatus`, `InterpretHealth`, `AggregateStatus` etc. In large fleets this is continuous unnecessary allocation and GC pressure. The script is immutable so recompiling it every time is pure waste. Sub-task of #7596.