Add region tags in OTLP trace sample

[psx95]

Add region tags in relevant sections to support documentation.

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• examples/otlptrace/build.gradle:28, tag opentelemetry_autoconf_otlp_required_deps
• examples/otlptrace/build.gradle:36, tag opentelemetry_autoconf_otlp_config
• examples/otlptrace/build.gradle:49, tag opentelemetry_autoconf_app_config
• examples/otlptrace/src/main/java/com/google/cloud/opentelemetry/example/otlptrace/OTLPTraceExample.java:20, tag opentelemetry_autoconf_essential_imports
• examples/otlptrace/src/main/java/com/google/cloud/opentelemetry/example/otlptrace/OTLPTraceExample.java:68, tag opentelemetry_autoconf_configure_sdk

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