function breakpoint(string) external;
function breakpoint(string, bool) external;Places a breakpoint to jump to in the debugger view.
Calling vm.breakpoint('<char>, true) is equivalent to vm.breakpoint('<char>), but calling vm.breakpoint('<char>, false) will erase the breakpoint at '<char>.
If the char is overwritten, only the last one that was visited in the execution steps is considered.
function testBreakpoint() public {
vm.breakpoint("a");
}Opening up the debugger in a test environment and pressing 'a will then place the debugger step at the place where the breakpoint cheatcode was called.
