Provide OSGi metadata for mutiny-zero-flow-adapters module, in support of usage in mutiny rxjava3 extension

[scottslewis]

It seems that the mutiny-zero-flow-adapters jar is required by mutiny rxjava3 integration. Here is the dependency for that project

[INFO] --- dependency:3.10.0:tree (default-cli) @ mutiny-rxjava3 ---
[INFO] io.smallrye.reactive:mutiny-rxjava3:jar:999-SNAPSHOT
[INFO] +- io.smallrye.reactive:mutiny:jar:999-SNAPSHOT:compile
[INFO] |  +- io.smallrye.common:smallrye-common-annotation:jar:2.17.0:compile
[INFO] |  \- org.jctools:jctools-core:jar:4.0.6:compile
[INFO] +- io.reactivex.rxjava3:rxjava:jar:3.1.12:compile
[INFO] |  \- org.reactivestreams:reactive-streams:jar:1.0.4:compile
[INFO] \- io.smallrye.reactive:mutiny-zero-flow-adapters:jar:1.2.0:compile
[INFO]    \- org.jspecify:jspecify:jar:1.0.0:compile

I have been contributing to commons annotation and the mutiny-core, and I will happily do the same for rxjava3 support, but as per the compile-time dependency above on the mutiny-zero-flow-adapters:

[INFO] - io.smallrye.reactive:mutiny-zero-flow-adapters:jar:1.2.0:compile

it will first be necessary to produce OSGi meta-data for this library.

pr for that will be forthcoming.