[inferno-ml] Change input/output representation

Changes the internal representation of InferenceParam inputs/outputs. Instead of having two separate inputs and outputs as vectors, they are now both in a single field and annotated with a ScriptInputType, which controls readability/writability of the input. Also, instead of being a Vector, they are now explicitly mapped to Inferno Idents

The rationale for the merging inputs/outputs:

We need to provide outputs as well as inputs as arguments during script evaluation. If we don't do this, the identifiers used in makeWrites will not resolve to anything
We can't just concatenate the old inputs and outputs fields, because users may wish to have identically named inputs and outputs; for example, they may want to both read from and write to input0. This would lead to the following during script eval:
```
fun input0 input0 -> ...
```
Accordingly, we need some way of allowing identically named identifiers to be both inputs and outputs. Combining the two argument types and storing if they are readable, writable, or both solves this

The rationale for storing the Inferno identifiers:

When scripts are created (e.g. via an Inferno LSP server), the only thing that is provided is the list of Inferno Idents
These [Ident] need to correspond exactly to the inputs that the InferenceParam contains
Even if we sort this list of identifiers, we need to make sure that the order of the InferenceParam's inputs is exactly the same as the order of the original [Ident]. This could lead to bug-prone assumptions or workarounds, since we would't have the original [Ident] in the param
To make sure that we always know which order is correct, we can store the Idents along with the actual inputs in a Map and then use Map.toAscList to get the correct order for script arguments

Also I fixed the JSON encoding/decoding so that NaNs can be transmitted to/from inferno-ml-server. Previously, [null, 0.0, 0.0] would parse to [IEmpty, IDouble 0.0, IDouble 0.0], which is of course incorrect. Now it correctly parses to [IDouble NaN, IDouble 0.0, IDouble 0.0]

plow-technologies / inferno

[inferno-ml] Change input/output representation #122