[FIX] web: contexts on field widgets + enforce bin_size for binary

Field widgets now have a key 'context' that let them
extend the context of the dataPoint (e.g. list).

In particular, widgets on binary fields enforce the contextual
item {bin_size: True}, so that the server gives the size of the
binary field as its value, instead of its content.

This change on binary fields reduces network load when accessing
a view with binary fields.

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