feat: Select column similar to polars' pl.col

[shane-breeze]

Is your feature request related to a problem?

Column selection seems to require the table, i.e.

table = con.table(...)
table.select(table.a+1, table.b+2, ...)

What is the motivation behind your request?

I'd like better support for chaining operations.

Describe the solution you'd like

A selector similar to polars' pl.col, i.e.

table = con.table(...).select(ibis.col("a")+1, ibis.col("b")+2)

What version of ibis are you running?

9.4.0

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

BigQuery

Code of Conduct

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[cpcloud]

We've got _ for that, and it's documented!