feat: custom traces in IndexingService.Query

[volmedo]

Wrapping up my work on custom instrumentation.

Some things can be improved but I think it will serve as an example when we come back to add more custom traces to other parts of the logic.

[alanshaw]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 56.09756% with 36 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/telemetry/otel.go	40.00%	9 Missing ⚠️
pkg/aws/service.go	0.00%	8 Missing ⚠️
pkg/service/providerindex/providerindex.go	61.11%	7 Missing ⚠️
pkg/service/service.go	74.07%	7 Missing ⚠️
cmd/lambda/providercache/main.go	0.00%	2 Missing ⚠️
cmd/lambda/remotesync/main.go	0.00%	2 Missing ⚠️
cmd/lambda/start.go	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
pkg/internal/testutil/helpers.go	100.00% <100.00%> (ø)
pkg/server/server.go	45.94% <100.00%> (+1.11%)	⬆️
cmd/lambda/start.go	0.00% <0.00%> (ø)
cmd/lambda/providercache/main.go	0.00% <0.00%> (ø)
cmd/lambda/remotesync/main.go	0.00% <0.00%> (ø)
pkg/service/providerindex/providerindex.go	35.85% <61.11%> (+2.52%)	⬆️
pkg/service/service.go	80.48% <74.07%> (-0.46%)	⬇️
pkg/aws/service.go	0.00% <0.00%> (ø)
pkg/telemetry/otel.go	11.76% <40.00%> (+11.76%)	⬆️

... and 1 file with indirect coverage changes