Add usage of InspectionSettings.eachScopeById

[JordanBoltonMN]

Long story short, it's to eventually better support type inspection for each expressions. Take for example

Table.AddColumn(tbl, "name", each [value] * [value])

We know the each expression's implicit argument is referencing tbl, but Intellisense doesn't know. This is the initial step towards that by adding a typing for the implicit argument under to EachExpressionScopeItem, which defaults to a value stored under eachScopeById (which when passed around accounts for most of the delta).

Eventually we'll write some hard coded mappings so whenever you reference a library function like Table.AddColumn it'll update eachScopeById.