feat: add network validation for subgraph contract addresse

[Harshdev098]

fix: #617

Adds a pre-deployment check to warn users if subgraph contract addresses don’t exist on the target network.

[changeset-bot]

🦋 Changeset detected

Latest commit: 39159cc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@graphprotocol/graph-cli	Minor

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[Harshdev098]

Hey @timmclean Can you please review it!

[YaroShkvorets]

I'll have a look

[YaroShkvorets]

A couple of things:

1. sign the commits (this is a repo requirement): https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits
2. make it pass lint pnpm lint and tests pnpm test
3. add minor-version changeset pnpm changeset

[Harshdev098]

@YaroShkvorets Thanks! Have done the required changes

[YaroShkvorets]

Commit should have this "verified" badge.

[Harshdev098]

But I have signedoff while amending the last commit @YaroShkvorets

[YaroShkvorets]

You haven't added GPG key to your GitHub account to make it verified: https://docs.github.com/en/authentication/managing-commit-signature-verification/about-commit-signature-verification

[Harshdev098]

@YaroShkvorets Yah have done it!

[YaroShkvorets]

This approach doesn't work.

You are querying Graph node JSON RPC endpoint for transaction count when you should be querying EVM chain JSON RPC instead. Graph node doesn't support eth_* methods.

Technically you can load the networks registry, get JSON RPC endpoint for that chain and try querying it. Just keep in mind that there could be dead ones, non-evm chains, and other edge cases you need to handle.

Also before submitting a PR it's a good idea to verify the fix works at least on a happy path.