Optional serde for phragmen support (#3994)

* Add serde to phragmen

* Update lock file

* and bump a version

* and bump a version again

* Apply suggestions from code review

Co-Authored-By: Bastian Köcher <[email protected]>

* revert impl-tarit for tuple update

* revert session.

* Revert "revert session."

This reverts commit 98086c9d.

* Revert "revert impl-tarit for tuple update"

This reverts commit 28a7fdde.