Add support for multi-instrument callbacks #2353

Job	Run time
php (7.4, false)	1m 42s
php (8.0, false)	1m 26s
php (8.1, false)	1m 20s
php (8.2, false)	1m 21s
php (8.3, false)	1m 27s
php (8.4, true, --ignore-platform-reqs)	19m 22s
packages / validate (7.4, ubuntu-latest, ast, json, grpc, false)	1m 30s
packages / validate (8.0, ubuntu-latest, ast, json, grpc, false)	49s
packages / validate (8.1, ubuntu-latest, ast, json, grpc, false)	1m 9s
packages / validate (8.2, ubuntu-latest, ast, json, grpc, false)	51s
packages / validate (8.3, ubuntu-latest, ast, json, grpc, false)	56s
	31m 53s

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