feat(`cheatcodes`): add support for `vm.expectCall` on internal calls

### Component

Forge

### Describe the feature you would like

Currently, `expectCall` doesn’t work for internal calls.

This limitation is highlighted in the documentation, but seems like there is no open issue addressing this (issue #432 is closed).

I wonder if there is a workaround for achieving this in Foundry.
In case there isn't, I believe this would be a very helpful feature that would simplify the testing process significantly.

Having `expectCall` support internal calls would enhance the functionality and flexibility of Foundry's testing capabilities.

### Additional context

_No response_