Add `vm.expectEmitAnonymous` cheatcode to support anonymous events

[zerosnacks]

Component

Forge

Describe the feature you would like

Add support for a new cheatcode: vm.expectEmitAnonymous(bool checkTopic0, bool checkTopic1, bool checkTopic2, bool checkTopic3, bool checkData) (and corresponding equivalent overloads).

The rationale is that vm.expectEmit always checks topic0, which is the event signature, and checking everything else is optional. But with an anonymous event, you don't have an event signature, so it doesn't make sense to still force the user to check topic0.

Closes: https://github.com/foundry-rs/foundry/issues/7457

Additional context

A previous attempt at working with anonymous events without topics was implemented here but was insufficient as it tried to patch in behaviour and created a possible footgun: https://github.com/foundry-rs/foundry/pull/7461

[tynes]

Wondering if this is being worked on at all as we would like to add some test coverage of anonymous events as part of https://github.com/ethereum-optimism/optimism/pull/10297