[Feature Request]: Support TIMESTAMP type in BigQueryIO with BEAM_ROW output type, and in read_gbq

[TheNeuralBit]

What would you like to happen?

We should read BQ's Timestamp type in the read_gbq wrapper

Part of #20810

Issue Priority

Priority: 2

Issue Component

Component: dsl-dataframe

[svetakvsundhar]

can close this issue 🥳 (sry i dont have perms i dont think)

[TheNeuralBit]

woohoo! Thanks @svetakvsundhar