Refactor LogExporter mod #8026

Job	Run time
msrv (windows-latest, 1.75.0)	1m 21s
test (ubuntu-latest, stable)	1m 53s
msrv (ubuntu-latest, 1.75.0)	33s
cargo-deny	24s
test (ubuntu-latest, beta)	1m 48s
docs	59s
external-types (opentelemetry)	56s
lint	59s
external-types (opentelemetry-sdk)	1m 5s
test (stable, windows-latest)	1m 52s
external-types (opentelemetry-otlp)	1m 15s
external-types (opentelemetry-zipkin)	1m 9s
coverage	1m 52s
test (stable, macos-latest)	1m 44s
test (stable, otel-linux-arm64)	2m 2s
	19m 52s

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