Support Elixir durations

[josevalim]

Elixir version

1.17.0

Database and Version

Any

Postgrex Version

Not yet supported

Current behavior

Postgrex.Duration is not supported.

Expected behavior

We should support the new durations and potentially deprecate Postgrex.Duration.

[greg-rychlewski]

For now were you just looking to encode Elixir durations? And then when we require 1.17 we can do the decoding/replace Postgrex.Duration?

[josevalim]

I think that's a good beginning, yeah! We could maybe already even allow defaulting to them via an option?

[josevalim]

This is in but we want to keep it around and eventually make it the default.