Add URL and description fields to generated substreams packages (BLO-808)

[Copilot]

Generated substreams packages were missing package.url and package.description fields, causing warnings during substreams build.

Changes

Added helper methods in base_state.go:

• GetPackageURL(): Returns https://github.com/username/{Name}-{ChainName}
• GetPackageDescription(): Returns Substreams module for {Name} on {ChainDisplayName}

Updated all 19 substreams.yaml.gotmpl templates to include:

package:
  name: {{ .GetModuleName }}
  version: v0.1.0
  url: {{ .GetPackageURL }}
  description: {{ .GetPackageDescription }}

Example Output

For project "my-project" on mainnet:

package:
  name: my_project
  version: v0.1.0
  url: https://github.com/username/my-project-mainnet
  description: Substreams module for my-project on Ethereum Mainnet

Affected Generators

All generators updated: evm-hello-world, evm-events-calls, evm-events-calls-raw (+ SQL variants), injective-events, injective-hello-world, mantra-events, mantra-hello-world, near-hello-world, sol-transactions, sol-anchor, sol-hello-world, starknet-events, starknet-hello-world, stellar-minimal, stellar-transactions-operations, tron-hello-world, tron-transactions.

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