Remove FullDuplexMode and HalfDuplexMode type params

[bugadani]

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Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
• I have used cargo xtask fmt-packages command to ensure that all changed code is formatted correctly.
• My changes were added to the CHANGELOG.md in the proper section.
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Pull Request Details 📖

Description

The biggest change is the ability to use HD and FD devices on the same bus at the same time. The changes got a bit involved, though.

[MabezDev]

LGTM, thanks!

[bjoernQ]

LGTM - just to be sure I also checked the examples requiring an external flash chip - still works