feat(subgraph): add subgraph module for indexing data

[hangleang]

Description

Add subgraph module and integrate into the workspace with the following functionality:

• support multiple network's deployment
• automate saved deployment into networks.json file for generating subgraph.yaml
• index all Poll related events, which has been deployed from the MACI contract instance

Additional Notes

every deployment of MACI contracts will be automatically updated the networks.json file, but you need to manually generate the subgraph.yaml by running pnpm run codegen:local in the subgraph directory

There is also some limitation of current implementation including:

• missing some properties to serve as complete data layer for MACI due to only indexing the events, not yet include the call function's handler
• missing test scripts

All of those will be improved later on while review the PR

Related issue(s)

Not related to any issue

Confirmation

• [x] I have read and understand MACI's contributor guidelines and code of conduct.
• [x] I have read and understand MACI's GitHub processes.
• [x] I have read and understand MACI's testing guide.

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[hangleang]

UPDATED

We no longer need to manually generate the subgraph.yaml file with pnpm run codegen:local command, which is also be removed from the script. it will automatically generate the file before deploying to the graph with specificed --network flag

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[hangleang]

sorry, click on the wrong button, please help remove the review request

[ctrlc03]

@hangleang could you rebase and fix the pnpm-lock conflict please?

[hangleang]

please check the latest commit, update recording to the contract changes

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