5130s are Comware based devices and support IRF (Intelligent Resilient Framework) stacking. This is a front-plane stacking technology, so you do not need to buy additional modules to support the stacking. You can stack up to 9 devices using the 10Gbps optics in the front panel SFP+ ports. I would recommend you don't go above 4 devices in a stack as there is the possibility for larger stacks to perform poorly. I'd also recommend using a ring topology for the stack.
Once the devices are stacked you can aggregate ports across chassis using the standard Bridge-Aggregation (L2) and Route-Aggregation (L3) commands. Configuring link-aggregation across chassis is the same as configuring link-aggregation on an unstacked single switch, apart from the interfaces are prefixed with the chassis number, so GigEthernet port 4 on chassis 2 becomes G2/0/4.
So yes, you can configure a link-aggregation group across devices and I have done this a number of times with 5130s.