Replace alive progress with tqdm

[itsdawei]

Description

Replace alive_progress with tqdm in examples since tqdm is more well-known and easier to use.

TODO

• [x] Replace in sphere.py
• [x] Replace in lunar_lander.py

Status

• [x] I have read the guidelines in CONTRIBUTING.md
• [x] I have formatted my code using yapf
• [x] I have tested my code by running pytest
• [x] I have linted my code with pylint
• [ ] I have added a one-line description of my change to the changelog in HISTORY.md
• [ ] This PR is ready to go

[btjanaka]

Addressed in #253