Add personal best time animations / alerts

[bryanlundberg]

What does this PR do? Drops a confetti animation after doing a single personal best time. Highlighted the average time after breaking the old record.

Related Issue(s)

165

Changes List the changes made in this PR. This could include new features, bug fixes, improvements, or any other modifications.

Screenshots or GIFs (if applicable)

single pb

https://github.com/bryanlundberg/NexusTimer/assets/119996547/dbf489ad-2c70-4f38-baca-9a99a95e9fb3

Averages PB

By submitting this PR, I confirm that:

• [x] I have reviewed my code and believe it is ready for merging.
• [x] I understand that this PR may be subject to review and changes.
• [x] I agree to abide by the code of conduct and contributing guidelines of this project.