Use Stream over LightDB Stream

[szczys]

• Rename examples/zephyr/lightdb_stream sample to examples/zephyr/stream
• Treewide: change all LightDB Stream references to Stream

This is ready for review but I've added the DNM tag so that it stays open until we're ready to merge as part of a larger release.

resolves https://github.com/golioth/firmware-issue-tracker/issues/524

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Code Coverage

Type	Coverage
lines	58.9% (1252 of 2125 lines)
functions	66.3% (124 of 187 functions)