feat(udfs): allow compiling udfs other than aggregate_funnel

[thmsobrmlr]

Problem

The UDF build process is setup just for the aggregate_funnel binary.

Changes

This PR makes the build process generic and allows building other binaries for usage in UDFs.

Details:

• Made the build script executable: chmod +x ./build.sh.
• Renamed the funnel_udfs folder to udfs and changed the directory structure to have a separate directory for each binary in src.
• Configured Cargo.toml to build separate binaries.
• Added a hello_world binary to test all this; should probably be removed before this is merge in.
• Added a README.

How did you test this code?

[posthog-bot]

This PR hasn't seen activity in a week! Should it be merged, closed, or further worked on? If you want to keep it open, post a comment or remove the stale label – otherwise this will be closed in another week. If you want to permanentely keep it open, use the waiting label.

[posthog-bot]

This PR was closed due to lack of activity. Feel free to reopen if it's still relevant.

[posthog-bot]

This PR hasn't seen activity in a week! Should it be merged, closed, or further worked on? If you want to keep it open, post a comment or remove the stale label – otherwise this will be closed in another week. If you want to permanentely keep it open, use the waiting label.

[posthog-bot]

This PR was closed due to lack of activity. Feel free to reopen if it's still relevant.

[aspicer]

@thmsobrmlr let me know if you wanted to get this in. happy to review it or try it to build

[thmsobrmlr]

@aspicer Yup, I'll update according to the new deployment workflow when I'm on support next week.