feat: import plugin sources and tests from WasmEdge core with git history #23

Part of the C++ plugin migration (upstream: WasmEdge/WasmEdge#3840).

Import the plugin sources, tests, and plugin-related CI utilities from WasmEdge/WasmEdge preserving git history. The 2024 import recorded in #1 (HEAD c5951a1d) is stale — redo it against current master.

• Re-run the history filter on a fresh clone:

  git clone https://github.com/WasmEdge/WasmEdge.git wasmedge-import
  cd wasmedge-import
  git filter-repo --path plugins --path test/plugins --path thirdparty/wasi_crypto \
    --path utils/docker --path utils/ffmpeg --path utils/opencvmini \
    --path utils/wasi-crypto --path utils/wasi-nn --path utils/wasi-test \
    --path utils/build_libpiper.sh

• Keep the imported layout as-is (plugins/<name>, test/plugins/<name>, thirdparty/wasi_crypto, utils/<name>) — renaming now would cost us git blame continuity.
• Rebase the filtered history onto current main (git rebase --onto <main> --root) so the result is linear history with no merge commit; push as branch import/wasmedge-master and open a PR. Original authors and their DCO sign-offs are preserved; only the committer is rewritten.
• Verify history survived: git log --oneline -- plugins/wasi_crypto | wc -l shows the full path-scoped history (~33 commits — history before the upstream plugins/ restructure (~2022) is not followed; it remains reachable upstream), and git blame plugins/wasi_crypto/ctx.h shows original authors.

Note: imported sources are not expected to build at this point — the standalone build system is a separate follow-up issue (see Relationships).

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