Move ConfigurableMetricExporterProvider to autoconfigure-spi

[jack-berg]

Now that metrics are stable we can stabilize the metric exporter provider SPI.

[codecov]

Codecov Report

Merging #4478 (98de65f) into main (dbe9a8e) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #4478      +/-   ##
============================================
- Coverage     90.12%   90.10%   -0.02%     
+ Complexity     5003     5002       -1     
============================================
  Files           569      569              
  Lines         15435    15435              
  Branches       1487     1487              
============================================
- Hits          13911    13908       -3     
- Misses         1061     1064       +3     
  Partials        463      463              

Impacted Files	Coverage Δ
...entelemetry/exporter/jaeger/PostSpansResponse.java	0.00% <0.00%> (-100.00%)	⬇️
...exporter/jaeger/MarshalerCollectorServiceGrpc.java	85.71% <0.00%> (-4.77%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update dbe9a8e...98de65f. Read the comment docs.