Update createBundle to set symbol input and output

[gcatron]

Description: This updates the create method on RuntimeBundle to properly set input and output status for symbols.
Testing: ninja test:
Documentation:
Fixes #1953

[SplitInfinity]

Let's also consider trainable Placeholders. I think this code will mark them as both inputs and outputs. Is that desired? If so, let's add a unit test for that too.

[nadavrot]

Consider the two scenarios: 1. We have a bug in this code that the unit test catches. 2. We need to change the design of the function to make PH an argument list.

Is this unit test carrying its weight? It will make it difficult for us to change the design of the compiler and at the same time won’t provide much safety. Maybe we can update an existing test instead of adding a new test that we will need to update later?

[nadavrot]

There is a bug here. Save nodes accept placeholders as inputs. If this is a save node you need to check if this is the destination.

[jfix71]

LGTM, just a few small nits.

Also wondering if it would be a good idea to add a QuantizationProfileNode to the test, so that you also check that a Placeholder that's not an output via a SaveNode is still marked as output, and that it's also marked as both input and output.

[nadavrot]

Nice!