Missing Type Annotations

There are missing type annotations for some functions in this library.

The `typing` module does not exist on CircuitPython devices so the import needs to be wrapped in try/except to catch the error for missing import. There is an example of how that is done here:

```python
try:
from typing import List, Tuple
except ImportError:
pass
```

Once imported the typing annotations for the argument type(s), and return type(s) can be added to the function signature. Here is an example of a function that has had this done already:

```python
def wrap_text_to_pixels(
string: str, max_width: int, font=None, indent0: str = "", indent1: str = ""
) -> List[str]:
```
If you are new to Git or Github we have a guide about contributing to our projects here: https://learn.adafruit.com/contribute-to-circuitpython-with-git-and-github

There is also a guide that covers our CI utilities and how to run them locally to ensure they will pass in Github Actions here: https://learn.adafruit.com/creating-and-sharing-a-circuitpython-library/check-your-code In particular the pages: `Sharing docs on ReadTheDocs` and `Check your code with pre-commit` contain the tools to install and commands to run locally to run the checks.

If you are attempting to resolve this issue and need help, you can post a comment on this issue and tag both @foamyguy and @kattni or reach out to us on Discord: https://adafru.it/discord in the `#circuitpython-dev` channel.

The following locations are reported by mypy to be missing type annotations:

- [ ] adafruit_matrixportal/graphics.py:56
- [ ] adafruit_matrixportal/network.py:52
- [ ] adafruit_matrixportal/matrix.py:59
- [ ] adafruit_matrixportal/matrixportal.py:74
- [ ] adafruit_matrixportal/matrixportal.py:134
- [ ] adafruit_matrixportal/matrixportal.py:199
- [ ] adafruit_matrixportal/matrixportal.py:242

Start with the seven locations listed in adafruit_matrixportal/graphics.py, network.py, matrix.py, and matrixportal.py, then inspect the existing typed function example. Run mypy or the repository's pre-commit checks as described in the linked CI guide. Done means all listed missing annotations are added, the typing import remains safe when unavailable on CircuitPython, and the checks pass.

Written by the indexing model from the issue text.