Need assembly resolution when loading custom bindings

For BYOB, none of the custom bindings are loading because the binding has a reference to Webjobs version X, and the script runtime refers to WebJobs version Y. We need to resolve so they all unify on Y.

Else none of the attributes and types line up, and we fail type checks like this:
https://github.com/Azure/azure-webjobs-sdk-script/blob/a1360cb2a3314dea8ba806d71690d6e6c26fea72/src/WebJobs.Script/Host/ScriptHost.cs

Start with the linked ScriptHost.cs file and trace how custom BYOB bindings are loaded and their assembly references are resolved. Confirm that bindings referencing a different WebJobs version unify with the script runtime version and that their attributes and types pass the existing type checks.

Written by the indexing model from the issue text.