where clause should allow for "blockNumber" property

[jellegerbrandy]

The graph supports s block argument https://thegraph.com/docs/graphql-api#queries that we can use to get the state of the blockchain at a specific block.

this can be supported easily by adding a few lines for options.block in

arc.js/src/utils.ts

Line 109 in d80b0c3

export function createGraphQlQuery(options: ICommonQueryOptions, where: string = '') {

We need this for common, where we are using the 2.0.0-experimental build

While we are doing this, it would also be a good idea to have a more restrictive type on createGraphQLQuery() that limits the kind of argument you can pass - we did not catch this at first in our code because we could add the block argument without any type error or runtime error (it just skips the argument silently)