feat: Allow add custom provider headers #1604

Job	Run time
php-cs	28s
test-alpine (amd64)	23s
examples (8.3, ubuntu-latest)	44s
test-alpine (arm64)	1m 30s
examples (8.3, macos-12)	2m 23s
unit (8.1, lowest)	19s
examples (8.3, macos-14)	1m 37s
unit (8.1, locked)	1m 4s
examples (windows-latest, json)	51s
unit (8.2, lowest)	16s
examples (windows-latest, binary)	41s
unit (8.2, locked)	17s
examples (windows-latest, multipart)	54s
examples (windows-latest, xml)	42s
unit (8.3, lowest)	19s
examples (windows-latest, message)	52s
unit (8.3, locked)	26s
examples (windows-latest, matchers)	51s
examples (windows-latest, generators)	52s
examples (windows-latest, csv)	52s
examples (windows-latest, protobuf-sync-message)	1m 26s
examples (windows-latest, protobuf-async-message)	1m 11s
examples (windows-latest, stub-server)	40s
finish	3s
	19m 41s

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