Make excel writer work for all types

[AdRiley]

Pull Request Description

Adds a test file with all of our data types in and a test that makes sure we can round trip it to and from excel.
Changes the logic for reading date, times and datetimes from Excel to use the format string to identify the data type

Important Notes

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  TypeScript,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• Unit tests have been written where possible.