allow endpoints with multiple device types

[koalatux]

Bridged devices need to implement multiple device types on an endpoint. Changing the device_types field in the Endpoint struct to a slice will allow that.

[semanticdiff-com]

Review changes with SemanticDiff.

Analyzed 7 of 7 files.

Overall, the semantic diff is 46% smaller than the GitHub diff.

	Filename	Status
✔️	rs-matter/tests/common/im_engine.rs	Analyzed
✔️	rs-matter/tests/common/e2e/im/handler.rs	Analyzed
✔️	rs-matter/src/data_model/root_endpoint.rs	50.81% smaller
✔️	rs-matter/src/data_model/system_model/descriptor.rs	75.17% smaller
✔️	rs-matter/src/data_model/objects/endpoint.rs	79.18% smaller
✔️	examples/onoff_light_bt/src/main.rs	51.04% smaller
✔️	examples/onoff_light/src/main.rs	38.38% smaller

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[ivmarkov]

@koalatux
(Sorry for asking, but I can't seem to resolve the CI errors in this PR by just re-running the jobs - the errors are actually not caused by your PR).
Can you make a dummy commit so that the PR CI gets re-triggered in a clean way?

[ivmarkov]

Thanks - let's wait a few days until #208 gets through. Otherwise I might need to rebase and given the size of it, I really would prefer to avoid this :D

[koalatux]

Ok, no problem. Just let me know if I need to rebase my PR when yours is merged.

[ivmarkov]

@kedars I'm merging this because the change surface is miniature and I'm quite sure this extension is correct.