Spec name tables for the OpenTelemetry GenAI semantic conventions — gen_ai.provider.name, gen_ai.operation.name, gen_ai.output.type, and the canonical span name.

Shared between ReqLLM.OpenTelemetry and ReqLLM.Telemetry.OpenTelemetry so they translate ReqLLM atoms to spec enum values identically.

iex> ReqLLM.OpenTelemetry.SemConv.provider_name(:amazon_bedrock)
"aws.bedrock"

iex> ReqLLM.OpenTelemetry.SemConv.operation_name(:embedding)
"embeddings"

iex> ReqLLM.OpenTelemetry.SemConv.span_name(:chat, "gpt-5")
"chat gpt-5"

Providers and operations not covered by the spec stringify their atom name unchanged.