Add paseo network `--chain` option and chain spec (#2668)
After some conversations around the topic of launching a community staging network ( [forum post 1](https://forum.polkadot.network/t/a-new-test-network-for-polkadot/4325), [forum post 2](https://forum.polkadot.network/t/the-new-polkadot-community-testnet/4956) ). And Erin having introduced the community testnet in the [last episode of AAG](https://www.youtube.com/watch?v=uzJEGVG78_E&t=1612s). I would like to include the `paseo` options as one of the chains available for launching using the polkadot node. Note that the chain spec implementation is not yet included at this stage. UPDATE: Merged master with rebase enabled and introduced quite some noise in this PR. Relevant changes are in: - `polkadot/node/service/chain-specs/paseo.json` - `polkadot/node/service/src/chain_spec.rs` - `polkadot/cli/src/command.rs` --------- Signed-off-by: dependabot[bot] <[email protected]> Signed-off-by: Oliver Tale-Yazdi <[email protected]> Co-authored-by: Oliver Tale-Yazdi <[email protected]> Co-authored-by: Bastian Köcher <[email protected]> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: Branislav Kontur <[email protected]> Co-authored-by: Liam Aharon <[email protected]> Co-authored-by: joe petrowski <[email protected]> Co-authored-by: Kian Paimani <[email protected]> Co-authored-by: Jegor Sidorenko <[email protected]> Co-authored-by: Alexander Theißen <[email protected]> Co-authored-by: Sergej Sakac <[email protected]> Co-authored-by: Dónal Murray <[email protected]> Co-authored-by: Adel Arja <[email protected]> Co-authored-by: Gonçalo Pestana <[email protected]> Co-authored-by: Ross Bulat <[email protected]> Co-authored-by: Francisco Gamundi <[email protected]> Co-authored-by: Adrian Catangiu <[email protected]>