3.x: Specify proper OSGi unique bundle symbolic name

[akarnokd]

The default was just the ArtifactID of "rxjava" which could become a problem in future major versions.

In addition, in the description, the unicode dash is now replaced with the ASCII dash to avoid encoding problems.

Related: #7318

[codecov]

Codecov Report

Merging #7319 (e2fefee) into 3.x (3e77f5c) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.x    #7319      +/-   ##
============================================
- Coverage     99.56%   99.55%   -0.01%     
+ Complexity     6784     6783       -1     
============================================
  Files           751      751              
  Lines         47490    47490              
  Branches       6378     6378              
============================================
- Hits          47284    47281       -3     
+ Misses           95       92       -3     
- Partials        111      117       +6     

Impacted Files	Coverage Δ
...ternal/operators/completable/CompletableMerge.java	97.29% <0.00%> (-2.71%)	⬇️
...nternal/operators/observable/ObservableCreate.java	96.58% <0.00%> (-2.57%)	⬇️
...ternal/operators/observable/ObservablePublish.java	97.29% <0.00%> (-1.81%)	⬇️
...nternal/operators/observable/ObservableWindow.java	98.21% <0.00%> (-1.79%)	⬇️
...3/internal/operators/flowable/FlowablePublish.java	99.00% <0.00%> (-1.00%)	⬇️
...perators/observable/ObservableMergeWithSingle.java	99.05% <0.00%> (-0.95%)	⬇️
...ternal/operators/observable/ObservableFlatMap.java	97.87% <0.00%> (-0.71%)	⬇️
...3/internal/operators/observable/ObservableZip.java	99.31% <0.00%> (-0.69%)	⬇️
...rnal/operators/flowable/FlowableFlatMapSingle.java	95.93% <0.00%> (-0.59%)	⬇️
.../reactivex/rxjava3/observers/BaseTestConsumer.java	99.46% <0.00%> (-0.54%)	⬇️
... and 9 more

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