[Debugger FR] Add option to disable breakpoints

It would be nice to have an option to disable breakpoints, similar to chrome devtools. I was running into this today when trying to look at another page (Memory), but I stopped being able to interact with my app because I hit a breakpoint in the debugger. In this case, being able to disable breakpoints without having to remove them would be useful.

Start by locating the debugger's breakpoint controls and the code handling breakpoint hits. Compare the requested behavior with Chrome DevTools, then verify that breakpoints can be disabled and re-enabled without removal and that the Memory page remains interactive while they are disabled.

Written by the indexing model from the issue text.