fix(components-core): align anchor menu with its content

[scott-williams-az]

Description

Issue of the problem found on app-degree-pages, which uses components-core anchor menu. The anchor menu hard codes the container-xl

Solution

The component will look at the content of the first item and align with those containers found or will default to container-xl Also added some performance to avoid re-rendering:

• optimized functions with multi state updates to only update state once
• moved sticky to state, bad practice to use a ref when we can use a state
• added throttle and debounce functions to limit scroll events

Alternate solution would be to add a prop for container

Links

• Unity reference site
• JIRA ticket
• Unity Design Kit

Checklist

• [x] Unity project successfully builds from root yarn install & yarn build
• [ ] Commits do not contain multiple scopes
• [ ] Add/updated examples
• [ ] No new console errors
• [ ] Accessibility checks

Browsers

• [ ] Chrome
• [ ] Safari
• [ ] Firefox
• [ ] Edge

Images