Indexed scripts: make sure headers are handed over to internal requests and streamline versioning support

The get, put and delete indexed script apis map to get, index and delete api and internally create those corresponding requests. We need to make sure that the original headers are handed over to the new request by passing the original request in the constructor when creating the new one.

Also streamlined the support for version and version_type in the REST layer since the parameters were not consistently parsed and set to the internal java API requests. Unified the Rest actions code to make sure that the same parameters are supported in both scripts and templates actions.

Modified the REST delete template and delete script actions to make use of a client instead of using the `ScriptService` directly.

Removed injected client from transport actions as script service has already its own, no need to pass another one in.