feat(duckdb/geospatial): top level `ibis.read_geo` function

[cpcloud]

Is your feature request related to a problem?

See https://ibis-project.zulipchat.com/#narrow/stream/405265-tech-support/topic/spatial.20column.20woes.

Describe the solution you'd like

An ibis.read_geo function analogous to the other top level ibis.read_* functions.

What version of ibis are you running?

main

What backend(s) are you using, if any?

DuckDB

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