feat(boto3): Add generic attributes that are common across services

[pabloDeputter]

• add generic attributes that are reused across different AWS services.
• request attributes must be created before span creation so streamed-span sampling can consider them.

Field	Value
span name	<modeled ServiceId>.<Operation>, for example S3.GetObject
sentry.op	http.client
sentry.origin	auto.http.boto3
rpc.system.name	aws-api
rpc.service	modeled service ID
rpc.method	modeled operation name
cloud.provider	aws
cloud.region	client region, when available
server.address	parsed endpoint hostname, when valid
server.port	endpoint port according to existing URL conventions

Sources

• https://opentelemetry.io/docs/specs/semconv/cloud-providers/aws-sdk/
• https://github.com/open-telemetry/opentelemetry-python-contrib/blob/main/instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/init.py

[linear-code]

PY-2775