add defaultValue as second arg for localcacheGet signature

[xinatcg]

Based on the Go runtime code, the function supports 2nd parameter as a default value.

code reference

https://github.com/heroiclabs/nakama/blob/b04438720b4bf2e848c7a98fce1290447f3fbf12/server/runtime_javascript_nakama.go#L8556C1-L8559C4

defVal := goja.Undefined()
		if f.Argument(1) != goja.Undefined() && f.Argument(1) != goja.Null() {
			defVal = f.Argument(1)
		}

[sesposito]

Just a small nit, but otherwise LGTM

[sesposito]

Suggested change

	* @param defaultValue - defaultValue if it cannot find.
	* @param defaultValue - default value returned if entry for key is not found.