merkledag: remove Batch

[mildred]

The Batch function from the DagService was not used. Remove it to simplify
code and allow IPLD implementation to take the place of merkledag.

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[mildred]

If we want to keep this code around, we can split the Batch object from the DagService and make it independent.

[hackergrrl]

Nice! Happy to see dead code go.

[whyrusleeping]

thats less dead code and more "unfinished", but i agree that we can split it out from the DagService when we get around to finishing that

[mildred]

I don't believe any longer this is necessary to remove. Perhaps the good thing to do instead would be to make it a standalone service that makes uses of the DAGService. Also, does it makes sense to have the Batch service where we already have a GetMany implemented in #2384?

[whyrusleeping]

👍 sounds good to me!