add a perchannel resp correction

[wenqiang-gu]

It's similar to PerChannelResponse, except that it uses a parameterized cold electronics function based on Xin's formula. An example response function is below:

Parameters for such response can be read from a json input file with a format below:

{
    "tick": 500.0,
    "t0": -2750.0,
    "channel_info": [
      {
        "channels": [0,1,2, ...],
        "gain": 1,
        "shaping": 1,
        "k3": 1,
        "k4": 1,
        "k5": 1,
        "k6": 1
      }
      {
        "channels": [4,5,6, ...],
        "gain": 1,
        "shaping": 1,
        "k3": 1,
        "k4": 1,
        "k5": 1,
        "k6": 1
      }

    ]
}

To use this ParamsPerChannelResponse in the signal processing, one need to enable it in the local params.jsonnet:

chresp: "protodunevd-params-channel-responses-v0.json.bz2", // default: null

[wenqiang-gu]

Hi @brettviren , we may discuss this update at this week's WireCell meeting. As suggested by Xin's meeting policy, I think it would be good if we could have some sort of agreement before the meeting.

[brettviren]

I think it looks good.