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`

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Signed-off-by: dependabot[bot] <[email protected]>
Signed-off-by: Oliver Tale-Yazdi <[email protected]>
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