objectbox: add recipe

[toge]

Specify library name and version: objectbox/0.17.0

Try to fix #11235.

---

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the conan-center hook activated.

[toge]

ConanException: Error 3221225781 while executing bin\test_package

It may be caused by failing to find objectbox.dll.
I am going to find the solution...

[SSE4]

yes, 3221225781 == C0000135 which is STATUS_DLL_NOT_FOUND

[toge]

@SSE4
Thank you!

[conan-center-bot]

All green in build 4 (13b22f77e4a103bba9f49d9708ec32fe4bdbdd18):

• objectbox/0.17.0@:
  All packages built successfully! (All logs)

[SpaceIm]

FYI this recipe doesn't follow CCI policies. It silently downloads pre-compiled binaries of objectbox at build time instead of building from source.
Instead this recipe should explicitly specify pre-compiled binaries to download in conandata.yml, so that each download is under control, and not pretend doing a true build from source.
There are probably more issues related to:

• package id because we don't know which compiler, cppstd, runtime or libcxx were used for each pre-compiled binary. Also macOS binary seems to be universal...
• dependency graph: what is vendored? It's a black box.

I'm not sure this recipe should have been accepted since it's closed-source.

[prince-chrismc]

The implementation of the database is closed but the API and libs are free to distribute. It's an edge case I added it to the shepherds meetings for the team to discuss. Gut reaction this is fine, it did not raise alram bells when I reviewed.

I think it this is not covered under our current guidelines but hopefully we can clarify that :)