reset a couple of versions down from v2.0 (#4572)

* reset a couple of versions down from v0.2.0

* Unstablise browser-utils (very new) and grafana-data-source (going to be replaced with prometheus sometime)

* unmark a bunch more client crates for stabilization

* fix versions in Cargo.tomls

* Downgrade network-test

* Set frame-metadata version to `10.0.0`

* Hide and documented storage generator as internal api

* Downgrade `sp-externalities`

* Downgrade `sc-cli`

* Downgrade sc-executor et al to 0.8.0

* Downgrade sp-state-machine to 0.8.0

* Downgrade pallet-contracts et al to 0.8.0

* Downgrade sp-sandbox to 0.8.0

* downgrade pallet-evm to 0.8.0

* Downgrade pallet-staking to 0.8.0

2.0 should be implementation of lazy payout alongside all the fixes of
current module

* Downgrade node-transaction-factory to 0.8.0

* frame pallets are 2.0.0

Co-authored-by: Ashley <ashley.ruglys@gmail.com>
Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Sergei Pepyakin <s.pepyakin@gmail.com>
Co-authored-by: Wei Tang <accounts@that.world>
Co-authored-by: thiolliere <gui.thiolliere@gmail.com>
Co-authored-by: Marcio Diaz <marcio@parity.io>