feat(go-feature-flag): Support exporter metadata #615

Job	Run time
php (ubuntu-latest, 8.0, hooks/OpenTelemetry)	56s
php (ubuntu-latest, 8.0, hooks/DDTrace)	41s
php (ubuntu-latest, 8.0, hooks/Validators)	44s
php (ubuntu-latest, 8.0, providers/Flagd)	43s
php (ubuntu-latest, 8.0, providers/Split)	42s
php (ubuntu-latest, 8.0, providers/GoFeatureFlag)	28s
php (ubuntu-latest, 8.1, hooks/OpenTelemetry)	56s
php (ubuntu-latest, 8.1, hooks/DDTrace)	39s
php (ubuntu-latest, 8.1, hooks/Validators)	48s
php (ubuntu-latest, 8.1, providers/Flagd)	42s
php (ubuntu-latest, 8.1, providers/Split)	43s
php (ubuntu-latest, 8.1, providers/GoFeatureFlag)	32s
php (ubuntu-latest, 8.2, hooks/OpenTelemetry)	42s
php (ubuntu-latest, 8.2, hooks/DDTrace)	42s
php (ubuntu-latest, 8.2, hooks/Validators)	41s
php (ubuntu-latest, 8.2, providers/Flagd)	42s
php (ubuntu-latest, 8.2, providers/Split)	52s
php (ubuntu-latest, 8.2, providers/GoFeatureFlag)	32s
	12m 45s

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