http-client-java, bug fix serialization dict of unknown

[weidongxu-microsoft]

fix #9638

Turns out the problem is in the mock data, we should use JSON string with double quote

            .withUnknown(BinaryData.fromBytes("\"dataxmqci\"".getBytes(StandardCharsets.UTF_8)))
            .withUnknownDict(
                mapOf("gdtopbobjogh", BinaryData.fromBytes("\"datavhkhixu\"".getBytes(StandardCharsets.UTF_8))))
            .withUnknownArray(Arrays.asList(BinaryData.fromBytes("\"dataw\"".getBytes(StandardCharsets.UTF_8))))
            .withUnknownDictArray(Arrays
                .asList(mapOf("hrzayvvtpgvdf", BinaryData.fromBytes("\"dataa\"".getBytes(StandardCharsets.UTF_8)))));

So, the change to element.writeTo is not strictly necessary. However. the change should improve better performance, as it no longer require another conversions to Object.

---

downstream
Azure/autorest.java#3283

sdk sync on dev

[github-actions]

All changed packages have been documented.

• ✅ @typespec/http-client-java

Show changes

@typespec/http-client-java - fix ✏️

Fix mock data for BinaryData.

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commit: 9536019

[azure-sdk]

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