gtest genesis parsing (!176)

* fix clippy

* fix after rebase

* WIP example specs

* fix after rebase

* add reproducibility

* doc add missing protobuf compiler

* remove ref to genesis timestamp

* fix broken next identity index genesis

* our pallets are not coming from the framework

* fix first_ud everywhere

* remove files unwanted on main branch

* also apply renaming to gdev

* rename first_ud_value and add comments

(to put in value the absence of first_ud_time)

* use index provided in GenesisIdty

* add mold to documentation

* change gtest existential deposit

and adapt genesis parsing to real-world data

* embed raw chainspecs only when enabled

* add comments