Add hello_ei sample#21

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mbarchie wants to merge 5 commits intomainfrom

ncsdk-36946-hello-ei

Commits on Dec 23, 2025

samples: Add hello_ei Edge Impulse ML inference sample
mbarchie
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Commits on Jan 2, 2026

samples: hello_ei: Use ring buffer for samples, minor fixes
mbarchie
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Commits on Jan 5, 2026

samples: hello_ei: Add asserts, fix buffer handling, comments, indents
mbarchie
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Commits on Jan 7, 2026

samples: hello_ei: Use EI C linkage
mbarchie
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Commits on Jan 9, 2026

samples: hello_ei: Refactor CMake build system with dual compilation modes
mbarchie
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