Add ebpf_version()

[lmb]

Export a function which allows retrieving the version string of the runtime. ebpf-go uses this information in its own testsuite to be able to assert that certain features are working given the necessary minimum version.

[dthaler]

Since you named it ebpf_version(), I take it there isn't an equivalent on Linux that needs to be matched in prototype?

Assuming not, the usual guidance on Windows is not to use the version number to check that specific features are available, but rather to use an api that tells specifically whether those features are available or not. That accounts for things like different SKUs that vary by feature (e.g., is JIT enabled or not isn't something that you can tell by a version check), and feature deprecation/removal in later versions. What specific features are you checking?

[saxena-anurag]

should this query the version from the runtime instead (i.e. from ebpfcore)?

[dthaler]

should this query the version from the runtime instead (i.e. from ebpfcore)?

Don't we already verify that ebpfapi matches ebpfcore at runtime? if so, this may be sufficient.