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685: Replace futures crate with pollster. r=grovesNL a=parasyte This PR removes all of the `futures` dependencies. `std::future` does not contain a lot of useful helpers available in `futures`. The obvious ones are `join_all`, `FutureExt::map`, and `block_on`. - `join_all` is replaced with a `Vec<T>` and an `async` block. - `FuturesExt::map` in the web backend is replaced by rolling the `map` function into the `MakeSendFuture` type. - `block_on` is provided by `pollster`. The original code using `join_all` ignored the result type yielded by the Future from `map_async`. This code does the same, but makes dropping the result a little more obvious. These should not be troublesome. Figured I would call them out anyway. The last big change is replacing `futures-executor` in the examples with `async-executor`. A new concrete `Spawner` type is used in the example framework instead of an implementation of `futures_task::LocalSpawn`. Fixes #628 Co-authored-by: Jay Oster <jay@kodewerx.org>