fix(cli): support shared foundry artifact deployments

[samsamtrum]

Summary

Adds support for multiple named deployments sharing one Foundry ABI artifact in the CLI Foundry plugin.

Problem

When several deployed contracts share the same ABI artifact (for example DAI and WETH both using ERC20.json), the Foundry plugin can currently only emit the artifact contract name. That means only one generated config/address pair is available for the shared ABI use case.

Changes

• Add a deploymentArtifacts mapping from deployment name to Foundry artifact name.
• When resolving an artifact, emit additional contract entries for deployment names mapped to that artifact.
• Keep the existing deployments address mapping behavior intact.
• Add test coverage for two deployment names sharing one ERC20 ABI artifact.

Example:

foundry({
  deployments: {
    DAI: '0x1111111111111111111111111111111111111111',
    WETH: '0x2222222222222222222222222222222222222222',
  },
  deploymentArtifacts: {
    DAI: 'ERC20',
    WETH: 'ERC20',
  },
})

This allows generated exports such as both daiConfig and wethConfig while reusing erc20Abi.

Verification

• corepack pnpm install --ignore-scripts --frozen-lockfile --filter @wagmi/cli...
• corepack pnpm exec biome check --write packages/cli/src/plugins/foundry.ts packages/cli/src/plugins/foundry.test.ts
• corepack pnpm exec vitest run packages/cli/src/plugins/foundry.test.ts -t 'contracts supports multiple deployment names sharing one ABI artifact'
• corepack pnpm --filter @wagmi/cli run check:types

Closes #4396

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