feat: introduce metrics framework for different metrics backend #790

83.71% (+0.06%) compared to 430045c

83.71% (+0.06%) compared to 430045c

Attention: Patch coverage is 88.13056% with 80 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
foyer-bench/src/exporter.rs	0.00%	37 Missing ⚠️
foyer-memory/src/cache.rs	60.97%	16 Missing ⚠️
foyer/src/hybrid/builder.rs	73.17%	11 Missing ⚠️
foyer-bench/src/main.rs	30.00%	7 Missing ⚠️
foyer-storage/src/device/monitor.rs	79.16%	5 Missing ⚠️
foyer/src/hybrid/cache.rs	80.95%	4 Missing ⚠️

Files with missing lines	Coverage Δ
foyer-common/src/metrics/model.rs	`100.00% <100.00%> (ø)`
foyer-common/src/metrics/registry/noop.rs	`100.00% <100.00%> (ø)`
foyer-common/src/metrics/registry/opentelemetry.rs	`100.00% <100.00%> (ø)`
foyer-common/src/metrics/registry/prometheus.rs	`100.00% <100.00%> (ø)`
foyer-memory/src/raw.rs	`91.10% <100.00%> (+0.05%)`	⬆️
foyer-storage/src/large/batch.rs	`83.07% <ø> (ø)`
foyer-storage/src/large/flusher.rs	`86.31% <100.00%> (+0.14%)`	⬆️
foyer-storage/src/large/generic.rs	`89.13% <100.00%> (+0.27%)`	⬆️
foyer-storage/src/large/reclaimer.rs	`85.48% <ø> (ø)`
foyer-storage/src/large/recover.rs	`90.29% <ø> (ø)`
... and 17 more

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