[Task][Go SDK]: Utility function for inferring field names based on struct tags

[johannaojeling]

What needs to happen?

There is a TODO in the bigqueryio.Read transform to infer column names from type t instead of using SELECT * in the query.

I would like a function, e.g. in the util package, which infers field names from a given struct type and tag key, and returns them as a []string.

It can be used in bigqueryio.Read to construct the select statement and for similar use cases, such as in spannerio.Read which currently uses its own unexported columnsFromStruct function.

Issue Priority

Priority: 2

Issue Component

Component: sdk-go

[johannaojeling]

.take-issue