Adding PerformanceObserver for long task and animation frame

[arafatkatze]

This PR is a part of the linear issue and @dominiccooney recommend this here

Test plan

Add the following right below the current additions

   setTimeout(() => {
            const start = performance.now();
            while (performance.now() - start < 100) {
                // Simulate a long task by blocking the main thread for 100ms
            }
            console.log('Fake long task executed');
        }, 1000);

        // Fake long animation frame
        requestAnimationFrame(() => {
            const start = performance.now();
            while (performance.now() - start < 100) {
                // Simulate a long animation frame by blocking the main thread for 100ms
            }
            console.log('Fake long animation frame executed');
        });

Run the code in debugger and in the console log you will see

Changelog

[github-actions]

‼️ Hey @sourcegraph/cody-security, please review this PR carefully as it introduces the usage of an unsafe_ function or abuses PromptString.