feat(subgraph): add subgraph integration

[0xmad]

• [x] Use subgraph for getting signup event
• [x] Use fallback maci-cli signup event parsing if there is no subgraph

Closes #153

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Name	Status	Preview	Comments	Updated (UTC)
maci-rpgf	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 11, 2024 7:07pm