feat: add support for offchain space creation

[wa0x6e]

Summary

Closes: https://github.com/snapshot-labs/workflow/issues/151

This PR adds the ability to create an offchain.
Workflow is stripped down to the basic, so not delegation/reasuries/etc...

NOTE: the process of configuring voteValidation when using the ticker strategy has been hidden, and is set automatically when necessary

Workflow-wise, it should feel natural, so no more details will be given for unbiaised feedback. (see todo below for missing features)

How to test

Start and connect this branch with a local instance of the hub and sequencer with

diff --git a/apps/ui/.env b/apps/ui/.env
index c136c279..de0836fe 100644
--- a/apps/ui/.env
+++ b/apps/ui/.env
@@ -1,5 +1,5 @@
-VITE_ENABLED_NETWORKS=
-VITE_METADATA_NETWORK=
+VITE_ENABLED_NETWORKS=s-tn,s,s-tn,eth,matic,arb1,base,oeth,sep,sn,sn-sep
+VITE_METADATA_NETWORK=s-tn
 VITE_MANA_URL=https://mana.box
 VITE_HIGHLIGHT_URL=https://testnet.highlight.red
 VITE_IPFS_GATEWAY=ipfs.snapshot.box
diff --git a/apps/ui/src/networks/offchain/index.ts b/apps/ui/src/networks/offchain/index.ts
index 013b4061..bba5a28b 100644
--- a/apps/ui/src/networks/offchain/index.ts
+++ b/apps/ui/src/networks/offchain/index.ts
@@ -9,8 +9,8 @@ import { createApi } from './api';
 import * as constants from './constants';

 const HUB_URLS: Partial<Record<NetworkID, string | undefined>> = {
-  s: 'https://hub.snapshot.org/graphql',
-  's-tn': 'https://testnet.hub.snapshot.org/graphql'
+  s: 'http://localhost:3000/graphql',
+  's-tn': 'http://localhost:3000/graphql'
 };
 export const SNAPSHOT_URLS: Partial<Record<NetworkID, string | undefined>> = {
   s: 'https://v1.snapshot.box',
diff --git a/packages/sx.js/src/clients/offchain/ethereum-sig/index.ts b/packages/sx.js/src/clients/offchain/ethereum-sig/index.ts
index edab0712..4ab868d6 100644
--- a/packages/sx.js/src/clients/offchain/ethereum-sig/index.ts
+++ b/packages/sx.js/src/clients/offchain/ethereum-sig/index.ts
@@ -58,8 +58,8 @@ import {
 import { encryptChoices } from '../utils';

 const SEQUENCER_URLS: Record<OffchainNetworkConfig['eip712ChainId'], string> = {
-  1: 'https://seq.snapshot.org',
-  5: 'https://testnet.seq.snapshot.org'
+  1: 'http://localhost:3001',
+  5: 'http://localhost:3001'
 };

 const RELAYER_URLS: Record<OffchainNetworkConfig['eip712ChainId'], string> = {

Order of VITE_ENABLED_NETWORKS matter, the first offchain network ID will be used as network for the offchain space creation

1. Go to http://localhost:8080/#/create
2. Follow the steps to create an onchain or offchain space
3. It should works

You can use impersonator and connect as 0x91FD2c8d24767db4Ece7069AA27832ffaf8590f3 on s-tn to see all possible ENS names errors

To-Do

Those extra feature will come in a later PR, as not essential

• Add a confirmation modal when exiting the space creation workflow (will also be used to clear cache, like ENS names cache)
• Push each step of the creation workflow in router history, so the browser BACK button will redirect to the previous step

[wa0x6e]

@bonustrack This feature can be tester for UI/workflow/UX. Will ask for code review once more polished

[bonustrack]

Some comments:

• We should not mention "Help Center" but "Helpdesk" instead.

• This loading should be aligned to the right

• I can't find the form for voting validation even when using ticket strategy. I think anyhow we shouldn't show ticket as the first option and whitelist as second in the voting strategies section. These are not the most common strategies, we should instead give easy access first to ERC 20 and ERC 721 strategies, and allow for custom strategy selection. We should also not have 2 different screens for voting strategies section ("quick selection" and "custom setup"), we should merge this to 1 screen, with the ability to see all the voting strategies.

• To simplify the flow we can also remove the shielded voting section.