Add service.name resource attribute to OTLP output

[apangin]

Description

OTLP profiles now include the service.name resource attribute, resolved according to OpenTelemetry SDK conventions, in the following lookup order:

1. otel.service.name system property
2. OTEL_SERVICE_NAME environment variable
3. service.name key in otel.resource.attributes system property
4. service.name key in OTEL_RESOURCE_ATTRIBUTES environment variable

When no service name is configured, the attribute is omitted.

Motivation and context

Profiling backends (e.g. Grafana Pyroscope) use service.name to attribute profiles to a service.
Without it, all profiles will be displayed under unknown.

How has this been tested?

+3 new integration tests

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

linux-arm64

File	Base (KiB)	Treatment (KiB)	Delta (KiB)	% Change
bin/asprof	89.59	89.59	+0.00	+0.00%
bin/jfrconv	136.23	136.51	+0.28	+0.20%
lib/libasyncProfiler.so	599.50	603.50	+4.00	+0.67%

macos

File	Base (KiB)	Treatment (KiB)	Delta (KiB)	% Change
bin/asprof	116.74	116.74	+0.00	+0.00%
bin/jfrconv	136.23	136.51	+0.28	+0.20%
lib/libasyncProfiler.dylib	952.73	952.91	+0.19	+0.02%