Support statuses filtering in MetaFilter

[mshriver]

Identified in #225 when the MetaFilter was introduced, metadata.statuses filtering correctly shows the counts of the call/setup/teardown in the value selection.

When this filter is selected, the array filtering fails, returning no result. Each metadata.statuses.call|setup|teardown field contains an array value with the result for that phase, and a boolean indicating whether xfail was enabled.

https://github.com/ibutsu/pytest-ibutsu/blob/f0275bd321f23073d3615fd7d56474dbc563d6ca/pytest_ibutsu.py#L479

MetaFilter should support filtering by these array type fields.