Support dynamic expressions in custom data factory types

[ezhong-msft]

Related to hashicorp/terraform-provider-azurerm#31352

As per my comment there:

It seems that the Azure Go SDK is interpreting these data factory properties which are supposed to support both expressions and their base types as just their base types. Thus a marshaling error occurs as the provider tries to convert the expression object to a bool type.
I believe this applies to all fields in data factory resources which are supposed to support expressions (except string, which seems to have already addressed this issue). For reference:

pandora/tools/importer-rest-api-specs/internal/components/apidefinitions/parser/parsingcontext/parse_object_definition.go

Line 267 in 47fa558

// Note: The spec here is for string or object that resolves to a string API-side. Since Go is statically typed we need to use a raw object here or JSON processing will fail

A comment was left for the fix on the string type "We may need to update the other dfe- primitives in time, however, this is not essential for the AzureRM provider support today." so maybe now it is the time to update them?