Issue #3478167: Add a global JSON decoder for both streaming and none streaming responses

ai.services.yml

src/OperationType/Chat/ReplayedChatMessageIterator.php

src/Service/PromptJsonDecoder/PromptJsonDecoder.php

src/Service/PromptJsonDecoder/PromptJsonDecoderInterface.php

...s/test-prompts/prompt-json-decoder/codeblock_no_json.yaml

.../test-prompts/prompt-json-decoder/escaped_json_quote.yaml

...s/test-prompts/prompt-json-decoder/json_in_free_text.yaml

...s/assets/test-prompts/prompt-json-decoder/json_quote.yaml

...prompts/prompt-json-decoder/json_with_newlines_in_it.yaml

tests/assets/test-prompts/prompt-json-decoder/just_text.yaml

...sets/test-prompts/prompt-json-decoder/placement_test.yaml

...sets/test-prompts/prompt-json-decoder/text_then_json.yaml

...st-prompts/prompt-json-decoder/text_with_broken_json.yaml

tests/src/Mock/MockIterator.php

tests/src/Mock/MockStreamedChatIterator.php

.../Unit/Service/PromptJsonDecoder/PromptJsonDecoderTest.php