Cannot reconstruct transactions referencing contracts in the same transaction via the Ledger API

For things like Daml Script dumps, you want to be able to turn the root commands of a transaction tree into Ledger API commands. This seems easy at first, create -> create command, exercise -> exercise command but it runs into issues once one command references an earlier contract created in the same transaction. You can in some cases translate this into `createAndExercise` but this falls apart if the exercise does not follow the create immediately. Here is a concrete example. Bob does not see the exercise but he sees `cid <- create`, `cid2 <- create`, `exercise cid …` which is not possible via the ledger API directly.

I see two options for Daml Script dumpsd
1. Just error out, clearly not a great solutoin.
2. We can generate a helper template and call `createAndExercise` on that but that doesn’t produce the original transaction structure so that’s kind of crappy and it’s also rather confusing.

I don’t really like either option but 2 seems slightly better.

```
module Main where

import Daml.Script

template T1
with
p : Party
where
signatory p
choice Create : ContractId T2
with
p' : Party
controller p
do cid <- create T2 with p1 = p, p2 = p'
create T2 with p1 = p, p2 = p'
exercise cid C

template T2
with
p1 : Party
p2 : Party
where
signatory p1
observer p2
choice C : ContractId T2
controller p1
do create this

test = do
let Some alice = partyFromText "Alice"
let Some bob = partyFromText "Bob"
cid <- submit alice $ createCmd (T1 alice)
submit alice $ exerciseCmd cid (Create bob)
```

Start by tracing the Daml Script dump path that reconstructs transaction trees into Ledger API commands, using the concrete T1/T2 example as the failing case. Determine how same-transaction contract references are represented and agree on the desired behavior between the two options described; done means the example can be handled through the Ledger API without silently changing the transaction structure.

Written by the indexing model from the issue text.