Use one transcript for both main code and LDT code

[tsunrise]

Problem Definition

For now, in BCS algorithm, LDT uses a separate transcript, and keeps a mutable reference of all oracles in another transcript. This is counterintuitive because the LDT algorithm is querying some oracles outside its own transcript.

Proposal

In the future, we can let both use same transcript. Instead of giving a Vec<&mut Oracle> to LDT, we can just give them Vec<MsgRoundRef>, which can make code much easier to understand.

Blocking: #6

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