Provide the chainId as a field in the ethereum.Block type

[PaulRBerg]

I was expecting the chainId value to be available in the ethereum.Block type, but it looks like it isn't available:

graph-tooling/packages/ts/chain/ethereum.ts

Lines 530 to 548 in 2eb15dd

	export class Block {
	constructor(
	public hash: Bytes,
	public parentHash: Bytes,
	public unclesHash: Bytes,
	public author: Address,
	public stateRoot: Bytes,
	public transactionsRoot: Bytes,
	public receiptsRoot: Bytes,
	public number: BigInt,
	public gasUsed: BigInt,
	public gasLimit: BigInt,
	public timestamp: BigInt,
	public difficulty: BigInt,
	public totalDifficulty: BigInt,
	public size: BigInt | null,
	public baseFeePerGas: BigInt | null,
	) {}
	}

Why?

In other development environments, e.g. in Solidity, the block.chainId field exists.

[PaulRBerg]

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