Add Jaeger copyright to all Go files that don't have it

[yurishkuro]

cc @objectiser

[codecov]

Codecov Report

Merging #1738 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1738      +/-   ##
==========================================
- Coverage   98.37%   98.33%   -0.05%     
==========================================
  Files         194      194              
  Lines        9521     9521              
==========================================
- Hits         9366     9362       -4     
- Misses        122      125       +3     
- Partials       33       34       +1

Impacted Files	Coverage Δ
plugin/storage/cassandra/spanstore/reader.go	100% <ø> (ø)	⬆️
model/adjuster/clockskew.go	100% <ø> (ø)	⬆️
...lugin/storage/cassandra/spanstore/dbmodel/model.go	100% <ø> (ø)	⬆️
cmd/agent/app/testutils/fixture.go	100% <ø> (ø)	⬆️
.../app/testutils/mock_baggage_restriction_manager.go	100% <ø> (ø)	⬆️
cmd/agent/app/reporter/reporter.go	100% <ø> (ø)	⬆️
plugin/storage/cassandra/factory.go	100% <ø> (ø)	⬆️
model/adjuster/adjuster.go	100% <ø> (ø)	⬆️
cmd/collector/app/builder/span_handler_builder.go	100% <ø> (ø)	⬆️
pkg/recoveryhandler/zap.go	100% <ø> (ø)	⬆️
... and 108 more

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