Add 'opensearch' as a supported value for SPAN_STORAGE_TYPE

[yurishkuro]

Resolves #3247

[codecov]

Codecov Report

Merging #3255 (75c331f) into master (b5d340d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3255   +/-   ##
=======================================
  Coverage   95.84%   95.85%           
=======================================
  Files         259      259           
  Lines       15398    15398           
=======================================
+ Hits        14758    14759    +1     
  Misses        550      550           
+ Partials       90       89    -1     

Impacted Files	Coverage Δ
plugin/storage/factory_config.go	100.00% <ø> (ø)
plugin/storage/factory.go	94.47% <100.00%> (ø)
pkg/config/tlscfg/cert_watcher.go	92.63% <0.00%> (-2.11%)	⬇️
plugin/storage/badger/spanstore/reader.go	95.50% <0.00%> (-0.71%)	⬇️
cmd/query/app/server.go	95.58% <0.00%> (+1.47%)	⬆️
cmd/query/app/static_handler.go	97.60% <0.00%> (+1.79%)	⬆️

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[albertteoh]

lgtm