Benchmark macro: Allow multiple bounds in where

[weichweich]

The where clause in the benchmark macro supports only a single trait bound for each type constraint.

benchmarks!{
	where_clause {
		where
			// the bound `ThisIsNotSupported`  won't work because there is no rule to match that
			<T as OtherConfig>::OtherEvent: Into<<T as Config>::Event> + ThisIsNotSupported
	}
	...
}

To support multiple bounds, I changed the macro to use tt instead of path and added a few more bounds in the tests to check if it's working.

[gui1117]

bot merge

[ghost]

Checks failed; merge aborted.

[gui1117]

maybe you can merge master to fix CI

[gui1117]

:-/ it seems you merged master while substrate and polkadot were broken. If you merge master again it should be fine

[weichweich]

:-/ it seems you merged master while substrate and polkadot were broken. If you merge master again it should be fine

I merged the latest master yesterday. There are no new commits to merge. :(

[gui1117]

:-/ it seems you merged master while substrate and polkadot were broken. If you merge master again it should be fine

I merged the latest master yesterday. There are no new commits to merge. :(

indeed, I just rerun the job and it worked