Reinstate stream_data as a deprecated property of StreamValue
Reinstate stream_data as a deprecated property of StreamValue

This (hopefully) fully replicates the old behaviour of stream_data, returning raw JSON data for lazy StreamValues and the tuple representation for non-lazy values.

wagtail/wagtail,rsalmaso/wagtail,torchbox/wagtail,rsalmaso/wagtail,jnns/wagtail,gasman/wagtail,thenewguy/wagtail,mixxorz/wagtail,zerolab/wagtail,torchbox/wagtail,jnns/wagtail,mixxorz/wagtail,thenewguy/wagtail,jnns/wagtail,mixxorz/wagtail,kaedroho/wagtail,thenewguy/wagtail,thenewguy/wagtail,kaedroho/wagtail,rsalmaso/wagtail,torchbox/wagtail,jnns/wagtail,kaedroho/wagtail,kaedroho/wagtail,gasman/wagtail,wagtail/wagtail,kaedroho/wagtail,mixxorz/wagtail,zerolab/wagtail,zerolab/wagtail,gasman/wagtail,wagtail/wagtail,rsalmaso/wagtail,rsalmaso/wagtail,gasman/wagtail,torchbox/wagtail,gasman/wagtail,zerolab/wagtail,wagtail/wagtail,mixxorz/wagtail,wagtail/wagtail,zerolab/wagtail,thenewguy/wagtail